Medical School · Year 3 · Psychiatry · includes a quiz and discussion video

Seminar 11: Somatic Symptom and Dissociative Disorders

Year 3: Psychiatry Clerkship

Learning Objectives

By the end of this seminar, students will be able to:

1. Diagnose somatic symptom disorder and related conditions
2. Recognize illness anxiety disorder
3. Differentiate conversion disorder (functional neurological symptom disorder)
4. Identify factitious disorder and malingering
5. Describe dissociative disorders
6. Apply appropriate treatment approaches

Seminar Outline

I. Overview of Somatic Symptom Disorders

The DSM-5 classification of somatic symptom and related disorders represents a significant reconceptualization from previous editions, shifting focus from the absence of medical explanation to the presence of excessive thoughts, feelings, and behaviors related to somatic symptoms. Somatic symptom disorder is characterized by distressing somatic symptoms accompanied by excessive thoughts, feelings, or behaviors about those symptoms. Illness anxiety disorder captures the preoccupation with having or acquiring a serious illness in the absence of significant somatic symptoms. Conversion disorder, now termed functional neurological symptom disorder, involves neurological symptoms that are incompatible with recognized neurological conditions. Factitious disorder involves the intentional falsification of medical or psychological symptoms to assume the sick role. Finally, psychological factors affecting other medical conditions recognizes situations where psychological or behavioral factors adversely affect existing medical conditions.

The historical evolution of these diagnostic categories reflects changing conceptualizations of the mind-body relationship in medicine. Previous terminology including somatization disorder, hypochondriasis, and conversion disorder carried connotations that symptoms were not real or were entirely psychological in origin, contributing to stigma and dismissive treatment. The DSM-5 approach emphasizes that patients with these conditions experience genuine suffering regardless of whether symptoms have identified medical causes, and that the defining feature is the degree to which thoughts, feelings, and behaviors related to symptoms are disproportionate and maladaptive. This reconceptualization encourages clinicians to validate patient distress, avoid the pursuit of unnecessary investigations, and focus on functional restoration rather than symptom elimination alone.

Several key concepts underpin the understanding and management of somatic symptom disorders in clinical practice. The mind-body connection is fundamental, recognizing that psychological factors can produce, amplify, or perpetuate physical symptoms through mechanisms including autonomic nervous system activation, immune modulation, and central sensitization. Importantly, patients with somatic symptom disorders are not faking their symptoms; their distress and impairment are real and warrant compassionate care. The phrase "it's all in your head" should be avoided, as it invalidates patient experience and undermines the therapeutic relationship. The diagnostic focus on behaviors and thoughts rather than symptom count or presence of medical explanation allows clinicians to identify problematic patterns that can be targeted in treatment.

Epidemiological data indicate that somatic symptom disorders are common in medical settings, with somatic symptom disorder affecting approximately 5-7% of the general population and representing an even higher proportion of primary care visits. Illness anxiety disorder affects approximately 1-2% of the population. Conversion disorder is less common, with incidence estimates of 2-5 per 100,000 per year, though functional neurological symptoms may account for a significant proportion of neurology referrals. Risk factors for somatic symptom disorders include female sex, lower socioeconomic status, history of trauma or childhood adversity, and comorbid depression and anxiety. Cultural factors influence symptom presentation, help-seeking behavior, and interpretation of bodily experiences, requiring culturally sensitive assessment and treatment approaches.

<image>Panel A: DSM-5 classification diagram showing the somatic symptom and related disorders category with each diagnosis (somatic symptom disorder, illness anxiety disorder, conversion disorder, factitious disorder, psychological factors affecting medical condition) and its defining features. Panel B: Historical evolution timeline showing the transition from somatization disorder and hypochondriasis to current DSM-5 categories with key conceptual changes highlighted. Panel C: Mind-body connection illustration depicting how psychological factors (stress, anxiety, attention) influence physical symptoms through autonomic, immune, and central nervous system pathways. Panel D: Epidemiological data visualization showing prevalence rates, risk factors, and healthcare utilization patterns for somatic symptom disorders.</image>

II. Somatic Symptom Disorder

Somatic symptom disorder in DSM-5 requires three criteria that together capture the essential features of disproportionate concern about physical symptoms. Criterion A specifies one or more somatic symptoms that are distressing or result in significant disruption of daily life, recognizing that even a single symptom can be the focus of excessive concern. Criterion B is the hallmark of the disorder, requiring excessive thoughts, feelings, or behaviors related to the somatic symptoms or associated health concerns, manifested by at least one of three features: disproportionate and persistent thoughts about the seriousness of symptoms, persistently high level of anxiety about health or symptoms, or excessive time and energy devoted to these symptoms or health concerns. Criterion C requires that although any one somatic symptom may not be continuously present, the state of being symptomatic is persistent, typically more than six months.

The Criterion B specifiers define the excessive psychological features that distinguish somatic symptom disorder from normal illness behavior. Disproportionate and persistent thoughts about symptom seriousness involve catastrophic interpretations of bodily sensations, with patients convinced that symptoms indicate serious disease despite reassurance and negative investigations. High anxiety about health or symptoms manifests as persistent worry, hypervigilance to bodily sensations, and anticipatory anxiety about developing additional symptoms or complications. Excessive time and energy devoted to symptoms and health concerns leads to frequent medical appointments, repeated investigations, internet searching about symptoms, and avoidance of activities that might trigger or worsen symptoms. The presence of any one of these features, along with distressing symptoms and chronicity, is sufficient for diagnosis.

The clinical presentation of somatic symptom disorder varies considerably in symptom type, severity, and associated features. Symptoms can affect any organ system, with pain, fatigue, gastrointestinal complaints, and neurological symptoms among the most common presentations. Many patients experience multiple symptoms simultaneously, though the diagnosis does not require any specific number. Doctor shopping behavior emerges as patients seek opinions from multiple providers, often hoping to find someone who will identify the cause of their suffering or provide the treatment they believe they need. Medical workups are typically extensive and unremarkable for significant pathology, though minor abnormalities may be overinterpreted as explanations for symptoms. The clinical course is often chronic, with symptoms waxing and waning over years and frequently shifting from one symptom or organ system to another.

Diagnostic specifiers in somatic symptom disorder provide additional characterization for clinical and research purposes. The with predominant pain specifier applies when pain is the dominant somatic symptom, replacing the previous diagnosis of pain disorder. The persistent specifier indicates a severe course characterized by marked symptoms, pronounced impairment, and duration of more than six months. Severity is rated as mild (only one of the Criterion B symptoms), moderate (two or more symptoms), or severe (two or more symptoms plus multiple somatic complaints or one very severe somatic symptom). These specifiers help clinicians communicate severity and guide treatment intensity, with more severe cases typically requiring more intensive multidisciplinary approaches.

<image>Panel A: Three-criteria diagnostic diagram for somatic symptom disorder showing Criterion A (distressing somatic symptoms), Criterion B (excessive thoughts, feelings, or behaviors with three specific manifestations), and Criterion C (persistent symptomatic state greater than 6 months). Panel B: Clinical scenario illustration depicting a patient with multiple provider visits, extensive normal testing results, and persistent concern about symptom seriousness despite reassurance. Panel C: Criterion B manifestations shown as interconnected features: disproportionate thoughts about seriousness, high health anxiety, and excessive time/energy devoted to symptoms. Panel D: Severity specifiers displayed as a gradient from mild (one Criterion B feature) through moderate (two or more) to severe (multiple features plus multiple or severe symptoms) with treatment intensity recommendations.</image>

III. Illness Anxiety Disorder

Illness anxiety disorder represents the DSM-5 reconceptualization of hypochondriasis, characterized by preoccupation with having or acquiring a serious illness in the relative absence of significant somatic symptoms. Criterion A specifies preoccupation with having or acquiring a serious illness, with the focus on the idea of being ill rather than on specific symptoms. Criterion B notes that somatic symptoms are not present or, if present, are only mild in intensity; if another medical condition is present or there is high risk for developing a medical condition, the preoccupation is clearly excessive or disproportionate. Criterion C requires a high level of anxiety about health, with the individual easily alarmed about personal health status. Criterion D specifies that the individual performs excessive health-related behaviors, such as repeatedly checking their body for signs of illness, or exhibits maladaptive avoidance, such as avoiding doctor appointments and hospitals. Criterion E establishes that illness preoccupation has been present for at least six months, though the specific illness feared may change over that time. Criterion F indicates that the illness-related preoccupation is not better explained by another mental disorder.

The two clinical subtypes of illness anxiety disorder reflect contrasting patterns of healthcare utilization that have implications for management. The care-seeking type involves excessive medical visits, repeated requests for investigations, and persistent attempts to obtain diagnosis and treatment despite reassurance and negative findings. These patients drive significant healthcare utilization and are well known to their providers, often presenting with requests for specific tests or referrals based on their own research. The care-avoidant type, in contrast, involves avoidance of medical care due to fear of receiving a serious diagnosis, with patients preferring uncertainty to confirmation of their feared illness. Both patterns are maladaptive but require different clinical approaches, with care-seeking patients needing scheduled regular appointments and limits on investigations, while care-avoidant patients need support to engage with appropriate medical care.

The clinical features of illness anxiety disorder center on cognitive preoccupation with disease rather than on bodily symptoms themselves. Patients typically fear a specific serious illness such as cancer, heart disease, or neurological conditions like multiple sclerosis or amyotrophic lateral sclerosis, though the feared disease may shift over time. Medical reassurance following negative investigations provides only temporary relief, with worry typically returning within hours to days as patients generate new reasons for concern or doubt the adequacy of testing. Internet searching for health information is common and typically increases rather than decreases anxiety, as patients selectively attend to information that confirms their fears. The preoccupation with illness may dominate the patient's life, affecting work, relationships, and quality of life even in the absence of any actual illness.

Differential diagnosis of illness anxiety disorder requires distinguishing it from conditions that may present with similar features of health anxiety but differ in important ways. Somatic symptom disorder is distinguished by the presence of significant, distressing somatic symptoms, while illness anxiety disorder is characterized primarily by the preoccupation with disease in the relative absence of symptoms. Generalized anxiety disorder involves excessive worry about multiple life domains, not just health, though health concerns may be one focus among many. Obsessive-compulsive disorder may include obsessions about illness and compulsive checking behaviors, but typically includes other obsessive-compulsive symptoms and has a different quality to the intrusive thoughts. Delusional disorder, somatic type, involves fixed false beliefs about having a disease that persist despite clear evidence to the contrary and cannot be shaken by reassurance, while illness anxiety disorder involves worry and fear rather than delusional conviction. Panic disorder may involve fears about health focused specifically on panic symptoms and their consequences rather than a generalized preoccupation with illness.

<image>Panel A: Six-criteria diagnostic structure for illness anxiety disorder showing preoccupation with serious illness, minimal symptoms, high health anxiety, excessive behaviors or avoidance, six-month duration, and exclusion of other disorders. Panel B: Care-seeking versus care-avoidant subtypes illustrated through contrasting clinical scenarios showing high versus low healthcare utilization patterns with treatment implications for each. Panel C: Reassurance-seeking cycle diagram showing negative test results leading to temporary relief, followed by new concerns or doubts, leading to renewed anxiety and further reassurance-seeking behavior. Panel D: Differential diagnosis comparison chart showing distinguishing features between illness anxiety disorder, somatic symptom disorder, GAD, OCD, delusional disorder somatic type, and panic disorder.</image>

IV. Conversion Disorder (FNSD)

Conversion disorder, designated in DSM-5 as functional neurological symptom disorder, is characterized by neurological symptoms affecting voluntary motor or sensory function that are incompatible with recognized neurological or medical conditions. Criterion A requires one or more symptoms of altered voluntary motor or sensory function, which may include weakness or paralysis, abnormal movements such as tremor or dystonia, swallowing symptoms, speech symptoms such as dysphonia or slurred speech, attacks or seizures, anesthesia or sensory loss, and special sensory symptoms affecting vision, hearing, or smell. Criterion B is essential and specifies that clinical findings provide evidence of incompatibility between the symptom and recognized neurological or medical conditions; this criterion emphasizes that conversion disorder should be a diagnosis based on positive evidence of inconsistency rather than simply absence of medical explanation. Criterion C requires that the symptom or deficit is not better explained by another medical or mental disorder. Criterion D specifies that the symptom causes clinically significant distress or impairment.

The common presentations of conversion disorder span motor and sensory domains, with specific patterns that differ from symptoms caused by structural neurological disease. Motor symptoms include weakness or paralysis that may affect limbs, face, or speech, abnormal movements including tremor, dystonia, myoclonus, and gait disorders, and attacks or seizures resembling epilepsy but without the expected electrophysiological correlates. Sensory symptoms include numbness, paresthesias, vision changes including tunnel vision and blindness, and hearing loss. The physical examination in conversion disorder often reveals patterns that would not be expected with lesions of the peripheral or central nervous system, such as sensory changes that respect the midline precisely, motor weakness that affects some movements but not others dependent on the same neural structures, or inconsistency between examination findings and observed function during unstructured activities.

Positive neurological signs provide the basis for a diagnosis of inclusion rather than diagnosis by exclusion of organic disease. Hoover's sign tests for functional leg weakness by detecting involuntary extension of the "weak" leg when the patient flexes the contralateral hip against resistance, demonstrating that the neural pathways for leg extension are intact. Give-way weakness refers to a pattern where the patient initially resists examiner's pressure but then suddenly collapses resistance, producing a ratchety pattern inconsistent with true weakness. Non-anatomic patterns include sensory loss that does not correspond to dermatomes, peripheral nerve distributions, or central lesions, such as hemisensory loss that splits precisely at the midline including on the face and trunk. Inconsistency in symptoms over time or between observed behavior and examination findings, such as a patient with apparent hemiplegia who demonstrates normal arm movement while distracted, supports the diagnosis. Distractibility refers to the improvement of symptoms when the patient's attention is drawn elsewhere.

Several important clinical points guide the appropriate approach to conversion disorder diagnosis and communication. Patients with conversion disorder are not faking their symptoms; the symptoms are genuine, involuntary, and cause real distress and disability. The diagnosis should be made based on positive findings demonstrating incompatibility with neurological disease, not simply by failing to find an organic explanation after extensive testing. Medical comorbidity is common, and patients with conversion disorder have the same rate of underlying medical conditions as the general population, so appropriate medical evaluation is necessary. Prognosis is variable, with better outcomes associated with acute onset, shorter duration before treatment, identifiable precipitating factors, and good premorbid functioning, while chronic symptoms with secondary gain predict poorer outcomes. Communicating the diagnosis requires skill, emphasizing that symptoms are real and treatable while explaining the functional nature of the condition in terms the patient can understand.

<image>Panel A: Common motor and sensory presentations of conversion disorder organized by domain (weakness/paralysis, abnormal movements, seizure-like episodes, sensory loss, vision/hearing changes) with clinical examples and typical examination findings. Panel B: Hoover's sign demonstration showing technique of hip flexion resistance testing and the expected involuntary contralateral hip extension that reveals intact neural pathways in functional weakness. Panel C: Non-anatomic patterns illustrated including midline splitting sensory loss, tubular visual fields, and weakness patterns that do not correspond to nerve root, peripheral nerve, or central lesion distributions. Panel D: Communication strategies for explaining functional neurological symptom disorder to patients, emphasizing that symptoms are real, the brain is not working properly but is not damaged, and effective treatments exist.</image>

V. Factitious Disorder and Malingering

Factitious disorder involves the falsification of physical or psychological signs or symptoms, or induction of injury or disease, in the absence of obvious external rewards, with the individual presenting themselves to others as ill, impaired, or injured. Criterion A specifies falsification of physical or psychological signs or symptoms, or induction of injury or disease, associated with identified deception. Criterion B requires that the individual presents himself or herself to others as ill, impaired, or injured. Criterion C specifies that the deceptive behavior is evident even in the absence of obvious external rewards, distinguishing factitious disorder from malingering where external incentives are present. Criterion D requires that the behavior is not better explained by another mental disorder, such as delusional disorder or another psychotic disorder. The motivation in factitious disorder is psychological, with patients seeking the sick role and its attendant care, attention, and freedom from normal responsibilities, even when these come at the cost of painful procedures, serious illness, or death.

The DSM-5 distinguishes two subtypes of factitious disorder based on whether symptoms are imposed on the self or on another person. Factitious disorder imposed on self describes the classic presentation in which patients falsify or induce their own illness through various means including fabricating symptoms, tampering with tests, self-inflicting injuries, or inducing illness through methods such as injecting contaminated material or taking medications to produce symptoms. Factitious disorder imposed on another, previously known as Munchausen syndrome by proxy, involves the falsification or induction of illness in another person, typically a child or dependent adult under the perpetrator's care. This form constitutes a serious form of abuse, as victims are subjected to unnecessary medical procedures, may suffer serious harm from induced illness, and experience psychological trauma from the caregiver's deception. The diagnosis is applied to the perpetrator, not the victim.

Malingering is fundamentally distinct from factitious disorder and is not considered a mental disorder in DSM-5, but rather a condition that may be a focus of clinical attention listed among other conditions. Malingering involves the intentional production of false or grossly exaggerated physical or psychological symptoms motivated by external incentives such as obtaining financial compensation, avoiding work or military service, evading criminal prosecution, or obtaining medications for abuse or sale. Unlike factitious disorder, where the motivation is the sick role itself, malingering is goal-directed behavior aimed at specific external rewards. Clinical suspicion for malingering should be raised when there is a medicolegal context to the presentation, marked discrepancy between claimed impairment and objective findings, lack of cooperation with diagnostic evaluation or treatment, or the presence of antisocial personality disorder. However, clinicians should approach suspicion of malingering with caution, as patients with genuine illness may be inappropriately labeled as malingerers.

The clinical distinction between factitious disorder, malingering, and somatic symptom disorder or conversion disorder rests on two dimensions: whether symptom production is conscious or unconscious, and what motivates the behavior. In somatic symptom disorder and conversion disorder, symptoms are not consciously produced or feigned; patients experience genuine symptoms that they do not voluntarily control. In factitious disorder, symptom production is conscious and intentional, but the motivation is psychological, specifically the assumption of the sick role. In malingering, symptom production is conscious and intentional, and the motivation is external gain rather than psychological needs. These distinctions have significant implications for treatment and for the clinician-patient relationship. Patients with somatic symptom disorder and conversion disorder warrant validation of their suffering and engagement in treatment. Patients with factitious disorder have a psychiatric condition that warrants compassionate treatment, though engaging them in treatment is challenging. Malingering, as a non-medical phenomenon, does not warrant treatment per se, though the clinician must maintain appropriate boundaries while completing any necessary evaluations.

<image>Panel A: Factitious disorder diagnostic criteria showing falsification/induction of illness, presentation as ill, absence of external rewards, and exclusion of other explanations, with the psychological motivation of assuming the sick role highlighted. Panel B: Factitious disorder imposed on another illustration showing a caregiver falsifying or inducing illness in a child victim, with indication that this constitutes abuse and the diagnosis applies to the perpetrator. Panel C: Malingering definition and clinical indicators (medicolegal context, discrepancy between claimed and observed impairment, non-cooperation, antisocial traits) with emphasis that this is not a mental disorder. Panel D: Two-by-two comparison matrix distinguishing factitious disorder, malingering, and somatic/conversion disorders based on conscious versus unconscious symptom production and internal (sick role) versus external (gain) motivation.</image>

VI. Treatment of Somatic Disorders

General treatment principles for somatic symptom disorders emphasize validation, consistency, and a focus on function rather than symptom elimination. Validating the patient's suffering communicates that their symptoms and distress are real and taken seriously, regardless of whether a medical cause is identified. Avoiding dismissive language such as "there's nothing wrong with you" or "it's all in your head" preserves the therapeutic relationship and keeps patients engaged in care. Scheduling regular visits at fixed intervals rather than in response to symptom exacerbations reduces the reinforcement of illness behavior and provides consistent support. Limiting unnecessary workup avoids iatrogenic harm from invasive procedures and the perpetuation of illness behavior while providing reassurance that appropriate evaluation has occurred. Establishing a single coordinating provider reduces fragmented care, inconsistent messages, and doctor shopping behavior. Maintaining a focus on function and quality of life rather than symptom cure sets realistic expectations and provides meaningful treatment goals.

Psychotherapeutic interventions for somatic symptom disorders have demonstrated efficacy in reducing symptom burden, distress, and healthcare utilization. Cognitive-behavioral therapy addresses the maladaptive thoughts, behaviors, and physiological responses that maintain symptoms, including catastrophic interpretations of bodily sensations, hypervigilance to physical symptoms, avoidance of activities, and deconditioning. Treatment components typically include psychoeducation about the mind-body connection, cognitive restructuring of illness beliefs, graduated behavioral activation, and stress management techniques. Mindfulness-based approaches help patients observe bodily sensations without catastrophic interpretation and develop acceptance of symptoms that facilitates engagement with life despite ongoing symptoms. Acceptance and commitment therapy emphasizes acceptance of symptoms and commitment to valued action rather than symptom elimination. Psychodynamic approaches may explore underlying conflicts, attachment patterns, or emotional experiences that manifest through physical symptoms.

Pharmacotherapy in somatic symptom disorders targets symptoms and comorbid conditions rather than serving as primary treatment. Antidepressants, particularly SSRIs and SNRIs, may be helpful for patients with comorbid depression or anxiety, which are common, and some evidence suggests benefit for somatic symptoms independent of mood effects, possibly through modulation of central pain processing. Tricyclic antidepressants at low doses are established treatments for chronic pain syndromes and may benefit patients with somatic symptom disorder with predominant pain. Opioids and benzodiazepines should generally be avoided for chronic somatic symptoms due to risks of dependence, the potential for these medications to perpetuate illness behavior, and evidence that they do not provide lasting benefit for chronic functional symptoms. When medications are used, clear expectations should be set regarding goals, duration, and criteria for continuation or discontinuation.

Collaborative care models optimize treatment by integrating primary care, mental health, and specialty services to provide comprehensive, coordinated care. Primary care plays a central role, providing medical management, serving as the consistent point of contact, and coordinating referrals. Psychiatric consultation contributes diagnostic clarification, medication recommendations, and guidance on management strategies. Physical therapy may be essential for patients with functional motor symptoms, providing graduated exposure to movement and retraining of motor function. Integrated behavioral health, with mental health providers embedded in primary care settings, facilitates access to psychological treatment and reduces the stigma associated with mental health referral. Case conferences bringing together all involved providers ensure consistent messaging and coordinated treatment planning.

<image>Panel A: General treatment principles shown as a clinical pathway: validate suffering, establish single provider, schedule regular visits, limit unnecessary workup, focus on function rather than cure, with patient engagement indicators. Panel B: CBT for somatic symptoms components illustrated: psychoeducation about mind-body connection, cognitive restructuring of illness beliefs, behavioral activation and graded activity, and stress management techniques. Panel C: Medication decision algorithm showing role of antidepressants for comorbid depression/anxiety and chronic pain, with cautions against opioids and benzodiazepines for chronic functional symptoms. Panel D: Collaborative care model diagram showing primary care at center with connections to psychiatry, physical therapy, integrated behavioral health, and specialty medical services with communication pathways indicated.</image>

VII. Dissociative Disorders Overview

The DSM-5 classification of dissociative disorders includes conditions characterized by disruption and/or discontinuity in the normal integration of consciousness, memory, identity, emotion, perception, behavior, and sense of self. Dissociative amnesia involves the inability to recall important autobiographical information, usually of a traumatic or stressful nature, that is inconsistent with ordinary forgetting. Depersonalization/derealization disorder is characterized by persistent or recurrent experiences of detachment from one's mental processes or body, or experiences of unreality of surroundings, with intact reality testing. Dissociative identity disorder, formerly called multiple personality disorder, involves the presence of two or more distinct personality states with associated discontinuities in sense of self and agency, accompanied by alterations in affect, behavior, consciousness, memory, perception, cognition, and/or sensorimotor functioning. Other specified and unspecified dissociative disorders capture presentations with dissociative features that do not meet full criteria for specific diagnoses.

Dissociation as a phenomenon exists on a continuum from normal experiences that most people have to pathological states that cause significant distress and impairment. Normal dissociative experiences include absorption in a movie or book to the point of losing awareness of surroundings, highway hypnosis when driving familiar routes, and minor lapses in attention. Pathological dissociation involves more pronounced disruptions that interfere with functioning, including significant memory gaps, experiences of depersonalization or derealization that are distressing and persistent, and identity confusion or fragmentation. Dissociation is conceptualized as a defense mechanism that allows the mind to escape from overwhelming experiences, with acute dissociation during trauma serving a protective function but chronic dissociative symptoms representing maladaptive persistence of this defense. The core symptoms of dissociation include depersonalization, derealization, amnesia, and identity confusion or alteration.

The relationship between dissociative disorders and trauma is well established, particularly for dissociative identity disorder, which shows strong associations with severe childhood trauma including physical and sexual abuse, neglect, and attachment disruption. Childhood trauma occurring during critical periods of identity formation may lead to compartmentalization of experiences, memories, and aspects of identity that would normally integrate into a unified sense of self. Adult trauma may also trigger dissociative symptoms, and dissociative features are common in post-traumatic stress disorder, with a dissociative subtype of PTSD recognized in DSM-5. The protective function of dissociation during trauma, allowing mental escape from unbearable experiences, may become maladaptive when dissociative responses persist beyond the traumatic situation or are triggered by reminders of trauma. Understanding the trauma-dissociation connection guides assessment and treatment.

Differential diagnosis of dissociative symptoms requires consideration of medical, substance-related, and other psychiatric conditions. PTSD with dissociative features may include depersonalization and derealization but is distinguished by the full PTSD symptom profile including re-experiencing, avoidance, and hyperarousal. Temporal lobe epilepsy can produce dissociative-like symptoms including automatisms, amnesia, and altered states of consciousness, and should be considered when symptoms are paroxysmal with consistent duration. Substance use may produce dissociative symptoms during intoxication or withdrawal, particularly with substances such as ketamine, phencyclidine, cannabis, and alcohol. Other neurological conditions including brain tumors, dementia, and sleep disorders may present with memory gaps or altered states. Other psychiatric conditions including borderline personality disorder, psychotic disorders, and malingering must be considered in the differential diagnosis.

<image>Panel A: DSM-5 dissociative disorders classification showing dissociative amnesia (with and without fugue), depersonalization/derealization disorder, dissociative identity disorder, and other specified conditions with key features of each. Panel B: Dissociation continuum from normal (absorption, highway hypnosis) through mild dissociative experiences to pathological dissociation with functional impairment, showing increasing severity and treatment implications. Panel C: Trauma-dissociation connection diagram illustrating how overwhelming childhood experiences during identity formation lead to compartmentalization and failure of normal integration, resulting in dissociative symptoms. Panel D: Differential diagnosis decision tree for dissociative symptoms considering PTSD, temporal lobe epilepsy, substance effects, neurological conditions, and other psychiatric disorders.</image>

VIII. Specific Dissociative Disorders

Dissociative amnesia is characterized by the inability to recall important autobiographical information, usually of a traumatic or stressful nature, that is inconsistent with ordinary forgetting. The amnesia typically involves localized or selective memory gaps related to specific traumatic events, though generalized amnesia affecting identity and life history can occur. Localized amnesia refers to inability to recall events during a circumscribed period of time, typically surrounding trauma. Selective amnesia involves inability to recall some but not all events during a circumscribed period. Generalized amnesia, which is rare, involves complete loss of memory for one's history and identity. Systematized amnesia involves loss of memory for a specific category of information, such as all memories related to a particular person or topic. Dissociative fugue, now a specifier for dissociative amnesia rather than a separate diagnosis, involves apparently purposeful travel or bewildered wandering associated with amnesia for identity or other important autobiographical information.

Depersonalization/derealization disorder is characterized by persistent or recurrent episodes of depersonalization, derealization, or both. Depersonalization involves experiences of unreality, detachment, or being an outside observer with respect to one's thoughts, feelings, sensations, body, or actions, such as feeling like a robot, being in a dream, or observing oneself from outside the body. Derealization involves experiences of unreality or detachment with respect to surroundings, with individuals or objects experienced as unreal, dreamlike, foggy, lifeless, or visually distorted. Crucially, reality testing remains intact; patients know their experiences are not real and do not believe they are actually robots, dreaming, or that the world has actually changed. The symptoms cause clinically significant distress or impairment, are not attributable to substances or another medical condition, and are not better explained by another mental disorder such as schizophrenia, panic disorder, major depression, PTSD, or another dissociative disorder.

Dissociative identity disorder is characterized by the presence of two or more distinct personality states or an experience of possession, with associated discontinuities in sense of self and agency accompanied by related alterations in affect, behavior, consciousness, memory, perception, cognition, and/or sensorimotor functioning. Recurrent gaps in the recall of everyday events, important personal information, and/or traumatic events that are inconsistent with ordinary forgetting constitute the second core criterion. The symptoms cause clinically significant distress or impairment. The disturbance is not a normal part of a broadly accepted cultural or religious practice, and symptoms are not attributable to substances or another medical condition. The distinct personality states, sometimes called "alters," may have their own characteristics including names, ages, genders, and mannerisms, and may take executive control of the body at different times. Time loss, the experience of gaps in memory during which another personality state was in control, is characteristic.

The clinical features of dissociative identity disorder extend beyond the diagnostic criteria and help clinicians recognize this often-missed diagnosis. Identity alteration involves the shifting between personality states, which may be evident as dramatic changes in demeanor, speech pattern, or expressed identity, or may be more subtle. Amnesia manifests as gaps in memory that patients may not initially report due to embarrassment, compensation strategies, or having become accustomed to the experience. "Lost time" refers to the patient's experience of hours or days passing without memory of events. The condition generates controversy in some clinical and academic circles regarding whether it represents a genuine disorder, an iatrogenic phenomenon produced by suggestive therapeutic techniques, or a form of role-playing, though the clinical consensus supports DID as a valid diagnosis most commonly arising from severe childhood trauma.

<image>Panel A: Dissociative amnesia subtypes illustrated: localized (gap around trauma), selective (some events during period), generalized (complete life history), and systematized (category-specific), with dissociative fugue specifier shown as purposeful travel with identity amnesia. Panel B: Depersonalization and derealization experiences depicted through patient descriptions and imagery: detachment from self (watching from outside), unreality of surroundings (dreamlike, foggy), with annotation that reality testing remains intact. Panel C: DID core features shown as interconnected: multiple personality states (alters) with distinct characteristics, switching between states, amnesia and time loss between states, with trauma history indicated as common antecedent. Panel D: Clinical presentation timeline for DID showing childhood trauma, development of dissociative defenses, adult presentation with identity confusion, and diagnostic recognition pathway.</image>

IX. Treatment of Dissociative Disorders

The general approach to treating dissociative disorders follows a phase-based model that prioritizes safety and stabilization before engaging in trauma processing. Phase 1 focuses on establishing safety, developing the therapeutic alliance, stabilizing symptoms, and building skills for managing dissociation and trauma-related distress. Phase 2, undertaken only when the patient is stable and has adequate coping resources, involves processing traumatic memories to reduce their power to trigger dissociative and other symptoms. Phase 3 addresses integration of identity and personality functioning, rehabilitation of daily functioning, and termination of treatment. This phase-based approach recognizes that premature trauma processing in unstable patients can be destabilizing and counterproductive, while patients who remain indefinitely in stabilization without ever addressing trauma may not achieve full recovery. The pace of progression through phases must be individualized based on patient stability and resources.

Psychotherapy is the primary treatment for dissociative disorders, with several modalities showing evidence of effectiveness. Phase-oriented trauma therapy following the three-phase model is the standard approach for DID and severe dissociative disorders, involving long-term treatment with therapists skilled in dissociation and trauma. Grounding techniques help patients manage acute dissociative episodes by bringing attention to the present moment through sensory focus, orientation to surroundings, and physiological regulation. Eye Movement Desensitization and Reprocessing may help with trauma processing once patients are stabilized, using bilateral stimulation while processing traumatic memories. Cognitive-behavioral approaches can address depersonalization/derealization symptoms, helping patients challenge catastrophic interpretations of dissociative experiences and reduce avoidance behaviors. Hypnotherapy may be useful in some cases but requires careful application by experienced practitioners to avoid suggestibility concerns.

Pharmacotherapy for dissociative disorders is entirely adjunctive, as no medications specifically treat dissociation itself. Treatment targets comorbid conditions that commonly co-occur with dissociative disorders, including depression, anxiety, and PTSD. SSRIs are commonly used for comorbid depression and anxiety, providing symptomatic relief that may facilitate engagement in psychotherapy. Prazosin may reduce trauma-related nightmares when PTSD symptoms are prominent. Benzodiazepines should generally be avoided or used with great caution, as they may worsen dissociative symptoms, impair memory consolidation needed for therapeutic work, and carry addiction risk in a population with elevated substance use vulnerability. Antipsychotics are not indicated for dissociative symptoms but may be considered if psychotic symptoms are also present. The overall role of medication is to reduce symptom burden sufficiently to allow effective engagement in psychotherapy.

Treatment goals for dissociative identity disorder extend beyond symptom reduction to address the fundamental fragmentation of identity that characterizes the condition. Phase 1 goals include safety and stabilization, symptom reduction, development of internal communication between personality states, and building a therapeutic alliance that encompasses all parts of the patient's identity system. Phase 2 involves trauma processing when the patient has sufficient stability and coping skills, working through traumatic memories in a way that all personality states can integrate. Phase 3 goals include integration or functional cooperation between personality states, rehabilitation of daily functioning, and development of a cohesive identity. The outcome goal may be full integration of personality states into a unified identity or, alternatively, functional cooperation among states that remain distinct but work together, depending on patient preferences and clinical trajectory.

<image>Panel A: Three-phase treatment model for dissociative disorders shown as sequential stages: Phase 1 (safety, stabilization, alliance, skills), Phase 2 (trauma processing when stable), Phase 3 (integration, rehabilitation), with indicators for timing and criteria for progression. Panel B: Grounding techniques illustrated with examples: sensory focus (5-4-3-2-1 technique), orientation to surroundings (naming time, place, safety), physical grounding (feet on floor, holding object), and physiological regulation (breathing techniques). Panel C: Medication role diagram showing adjunctive treatment of comorbid conditions (depression, anxiety, PTSD) with SSRIs and prazosin, with warning about benzodiazepines and note that no medications treat dissociation directly. Panel D: DID treatment trajectory showing development of internal communication between alters, trauma processing with all parts, and either integration into unified identity or functional cooperation as alternative positive outcomes.</image>

X. Special Considerations

Assessment of somatic and dissociative disorders requires comprehensive evaluation integrating psychiatric and medical perspectives. Thorough history-taking explores symptom onset, course, and context, including any temporal relationship with trauma, stressors, or life events. Medical and psychiatric history should include previous diagnoses, evaluations, and treatments, as well as family history of similar conditions. Physical examination should be appropriate to rule out medical conditions that could explain symptoms, with the extent of workup guided by clinical presentation and prior evaluation. Collateral information from family members, previous providers, and medical records helps characterize patterns the patient may not recognize or report. Screening tools such as the Dissociative Experiences Scale can help identify dissociative symptoms that warrant further assessment. Structured diagnostic interviews including the SCID-D for dissociative disorders provide systematic assessment of diagnostic criteria.

The medical-psychiatric interface presents unique challenges in the care of patients with somatic symptom and dissociative disorders. Sufficient medical workup is necessary to rule out treatable conditions without pursuing excessive testing that can reinforce illness behavior and cause iatrogenic harm. Communication between providers is essential to ensure consistent messaging and coordinated care, preventing the fragmented treatment that can perpetuate dysfunction. Iatrogenic harm can result from unnecessary procedures, inappropriate medications, or inadvertent reinforcement of illness behavior through excessive attention to symptoms. Chronic pain conditions frequently co-occur with somatic symptom disorders, requiring integrated treatment approaches that address both the medical and psychological aspects of pain. Primary care providers often serve as the cornerstone of care, with psychiatric consultation supporting their management rather than replacing their central role.

Common challenges in the care of these patients require specific management strategies to maintain effective treatment. Provider frustration is common when patients do not improve or seem to undermine treatment efforts; understanding the disorder's nature and obtaining supervision help clinicians manage these reactions. Scheduling regular appointments at fixed intervals, regardless of symptom status, provides consistent support and reduces symptom-contingent healthcare utilization. Clear boundaries regarding prescriptions for controlled substances, additional investigations, and between-session contact help maintain an appropriate treatment frame. Coordinating care among multiple providers ensures consistent messaging and prevents splitting. Reframing the clinical perspective away from "heartsink patients" toward understanding the genuine suffering and treatable nature of these conditions improves both clinician well-being and patient outcomes.

Prognosis in somatic and dissociative disorders varies based on presentation, duration, and treatment engagement. Acute onset and shorter duration before treatment predict better outcomes, as symptoms have had less time to become entrenched in the patient's identity and lifestyle. Chronic presentations with secondary gain, such as disability status or caregiver attention, present greater treatment challenges. Comorbid conditions including depression, anxiety, and personality disorders affect outcome and require treatment. Treatment engagement is essential, as patients who fully participate in evidence-based treatment show better outcomes than those who remain ambivalent or drop out. Social support serves a protective function, while isolation and family dysfunction may perpetuate symptoms. With appropriate treatment, many patients show significant improvement in symptoms and functioning, though chronic courses are common and cure should not be the primary expectation.

<image>Panel A: Comprehensive assessment framework for somatic/dissociative disorders showing history (symptom timeline, trauma history), physical examination, medical workup extent, collateral information, screening tools (DES), and structured interviews. Panel B: Medical-psychiatric interface diagram illustrating appropriate workup extent (sufficient but not excessive), provider communication pathways, iatrogenic harm avoidance, and primary care's central coordinating role. Panel C: Clinical challenges and strategies grid showing provider frustration (supervision, understanding disorder), healthcare utilization (scheduled visits), boundary issues (clear limits), and care coordination (team communication). Panel D: Prognostic factors displayed as positive (acute onset, short duration, treatment engagement, social support) versus negative (chronic course, secondary gain, comorbidity, poor engagement) with expected outcomes indicated.</image>

Summary

• Somatic symptom disorder requires one or more distressing somatic symptoms plus excessive thoughts, feelings, or behaviors about symptoms lasting more than six months; focus has shifted from absence of medical explanation to presence of disproportionate concern
• Illness anxiety disorder involves preoccupation with having or acquiring serious illness with minimal or absent somatic symptoms; subtypes are care-seeking (frequent visits) versus care-avoidant (avoids doctors due to fear)
• Conversion disorder (functional neurological symptom disorder) involves neurological symptoms that are incompatible with recognized neurological conditions; positive signs (Hoover, give-way weakness) support diagnosis of inclusion
• Factitious disorder involves intentional production of symptoms for the sick role (internal motivation); imposed on self or another (formerly Munchausen by proxy)
• Malingering involves intentional production of symptoms for external gain (financial, legal, avoiding responsibility); not a mental disorder
• Treatment principles for somatic disorders: validate suffering, schedule regular visits (not symptom-contingent), limit unnecessary workup, establish single coordinating provider, focus on function not cure
• Dissociative amnesia involves inability to recall important autobiographical information, usually traumatic; may include fugue (travel with identity amnesia)
• Depersonalization/derealization disorder involves feeling detached from self or surroundings seem unreal; reality testing remains intact (patient knows it's not real)
• DID involves two or more distinct personality states plus amnesia; strongly associated with severe childhood trauma; phase-based treatment (stabilization, trauma processing, integration)
• No medications specifically treat dissociation; pharmacotherapy targets comorbid depression, anxiety, and PTSD; benzodiazepines may worsen dissociation and should be avoided

Key Terms

This content is subject to the MIT License. © 2024–2026 Hibbert School of Medicine.

Read this lecture as Markdown