Residency · Residency · Child & Adolescent Psychiatry

Pediatric Pain and the Psychiatric Interface

Introduction

Pain is one of the most common reasons children present to medical care, and chronic pain affects approximately 20-35% of children and adolescents worldwide. The relationship between pain and psychiatric illness is bidirectional: psychiatric conditions amplify pain perception, and chronic pain increases the risk of psychiatric disorders. Child and adolescent psychiatrists play a critical role in multidisciplinary pain management, addressing both the psychological contributors to and consequences of pain.

Definitions and Classification

Acute pain is time-limited, typically linked to tissue injury or disease, and serves a protective function. Chronic pain is pain lasting longer than three months or beyond the expected healing period. Functional pain describes chronic pain without identifiable tissue pathology, as seen in functional abdominal pain and chronic headache. Central sensitization involves amplified pain signaling in the central nervous system, leading to hyperalgesia and allodynia.

Neurobiology of Pain and Emotion

Pain and emotion share overlapping neural circuits, including the anterior cingulate cortex, insula, and prefrontal cortex. The descending modulatory pain pathway, which runs through the periaqueductal gray and rostral ventromedial medulla, is influenced by emotional states. Catastrophizing activates brain regions associated with pain amplification. Chronic stress and adverse childhood experiences alter hypothalamic-pituitary-adrenal axis function and increase pain sensitivity. Serotonin and norepinephrine are involved in both mood regulation and endogenous pain modulation, providing a neurobiological basis for the efficacy of certain antidepressants in pain management.

Psychiatric Comorbidity in Pediatric Chronic Pain

Depression

Depression is present in 25-40% of children with chronic pain. The relationship is bidirectional: depression lowers the pain threshold, while chronic pain causes hopelessness and withdrawal. Sleep disturbance is a shared feature that exacerbates both conditions.

Anxiety Disorders

Anxiety sensitivity, which is the fear of anxiety-related physical sensations, amplifies pain perception. Pain-related anxiety and avoidance behavior drive functional disability beyond what the pain alone would produce. Generalized anxiety, separation anxiety, and social anxiety are all overrepresented in children with chronic pain.

PTSD and Trauma

Trauma history is a significant risk factor for the development of chronic pain. Somatization is a common trauma response in children. Medical procedures themselves can be a source of medical traumatic stress.

ADHD

Children with ADHD may have altered pain perception and processing. Stimulant medications do not generally worsen pain conditions.

Somatoform Spectrum

There is significant overlap between chronic pain and somatic symptom disorder. Functional pain syndromes may co-occur with conversion symptoms.

Assessment

Pain Assessment Tools

Self-report tools include the Visual Analog Scale and the Faces Pain Scale-Revised. The FLACC scale, which evaluates Face, Legs, Activity, Cry, and Consolability, is used for pre-verbal or non-verbal children. The Functional Disability Inventory assesses functional limitations. The Pain Catastrophizing Scale for Children measures catastrophic thinking about pain.

Psychiatric Assessment

Screening for depression, anxiety, PTSD, and sleep disorders should be routine. Functional impairment across school attendance, physical activity, and social participation should be evaluated. Coping strategies, distinguishing between active and avoidant approaches, should be assessed. Family assessment should include parental pain catastrophizing and reinforcement of sick-role behaviors. Adverse childhood experiences screening provides important context.

Treatment

Cognitive-Behavioral Therapy

CBT is the gold standard psychological treatment for pediatric chronic pain. It targets catastrophizing, fear-avoidance beliefs, and behavioral withdrawal. Components include psychoeducation, cognitive restructuring, relaxation training, graded activity, and exposure. Meta-analyses demonstrate moderate effect sizes for both pain reduction and functional improvement.

Acceptance and Commitment Therapy

ACT emphasizes psychological flexibility and value-driven action despite pain. It is particularly useful when pain cannot be eliminated. There is a growing evidence base for ACT in pediatric populations.

Biofeedback and Relaxation

Biofeedback teaches voluntary control of physiological processes such as heart rate variability and muscle tension. Diaphragmatic breathing, progressive muscle relaxation, and guided imagery are effective complementary techniques. These approaches have demonstrated efficacy for chronic headache and functional abdominal pain.

Pharmacotherapy

Amitriptyline is first-line for neuropathic and functional pain, typically started at 0.1 mg/kg and titrated slowly. Duloxetine, a dual serotonin-norepinephrine reuptake inhibitor, is FDA-approved for certain pain conditions in adults. Gabapentin and pregabalin are useful for neuropathic pain and may help with comorbid anxiety. SSRIs treat comorbid depression and anxiety and may have modest analgesic benefit. Chronic opioid therapy should be avoided in pediatric chronic pain due to the risks of dependence and opioid-induced hyperalgesia. Comorbid insomnia should be treated with melatonin, sleep hygiene measures, or low-dose trazodone.

Multidisciplinary Pain Programs

Intensive interdisciplinary pain rehabilitation combines psychology, physical therapy, occupational therapy, and medical management. These programs emphasize functional restoration over pain elimination. Evidence demonstrates significant and sustained improvement in functioning and school attendance.

Family Considerations

Parental responses to child pain significantly influence child outcomes. Parental pain catastrophizing and solicitous responses are modifiable treatment targets. Parent training in operant strategies that reinforce function rather than pain behavior is evidence-based. Siblings may also be affected by the family's focus on the child with chronic pain.

Clinical Pearls

Pain is always real, whether or not identifiable tissue pathology exists; a child's pain should never be dismissed as fabricated. Functional restoration, not pain elimination, should be the primary treatment goal in chronic pain management. Parental pain catastrophizing is one of the strongest predictors of child disability and must be addressed in treatment. CBT has the strongest evidence base for pediatric chronic pain and should be a first-line intervention alongside any pharmacotherapy.

References

1. Fisher E, et al. "Psychological Therapies for the Management of Chronic and Recurrent Pain in Children and Adolescents." Cochrane Database of Systematic Reviews. 2018;9:CD003968.
2. Palermo TM. Cognitive-Behavioral Therapy for Chronic Pain in Children and Adolescents. New York: Oxford University Press; 2012.
3. Simons LE, et al. "The Fear of Pain Questionnaire: Assessment of Pain-Related Fear Among Children and Adolescents." Journal of Pain. 2011;12(6):677-686.
4. Eccleston C, et al. "Psychological Therapies for the Management of Chronic Pain in Children and Adolescents: An Updated Systematic Review." Pain. 2014;155(10):2010-2020.

For the intern

At 3am, your priority is ruling out serious pathology requiring immediate intervention: intussusception, appendicitis, meningitis, testicular torsion, or acute traumatic injury. Obtain vital signs, perform a focused physical exam, and order indicated labs or imaging. Provide immediate pain relief with age-appropriate analgesia (acetaminophen, ibuprofen, or in severe cases, IV opioids for acute injuries). What can wait until morning: comprehensive psychiatric assessment, chronic pain medication adjustments, family dynamics evaluation, and coordination with multidisciplinary pain teams. If you suspect functional or chronic pain in the emergency setting, focus on safety, provide supportive reassurance, and arrange outpatient follow-up rather than initiating complex interventions overnight.

Common pitfalls

• Dismissing pain as "just psychological" – All pain involves real neurobiological processes. Telling families "it's all in their head" destroys therapeutic alliance and delays proper treatment. Frame pain as a brain-body interaction requiring multidisciplinary care.

• Prescribing chronic opioids for non-malignant pediatric pain – Opioids cause hyperalgesia, dependence, and functional decline in chronic pain. Use amitriptyline, gabapentin, or SNRIs instead, combined with CBT and physical therapy.

• Ignoring parental catastrophizing – Parents who catastrophize about their child's pain inadvertently reinforce disability. Address parental anxiety and pain beliefs directly; outcomes improve when parents learn operant strategies reinforcing function over pain behaviors.

• Setting pain elimination as the goal – Chronic pain often cannot be eliminated. Functional restoration (return to school, activities, socialization) despite residual pain is the appropriate target and prevents demoralization when complete pain relief proves elusive.

<image> Create a clinical decision algorithm flowchart with the following structure:

Panel 1 (Top): A box labeled "Child presents with pain" with two branches: "Acute onset (<3 months)" leading right and "Chronic/recurrent (≥3 months)" leading down.

Panel 2 (Right side): The acute branch leads to "Red flags present?" (fever, neurological signs, trauma, surgical abdomen) with YES leading to "Emergency workup + immediate analgesia" and NO leading to "Treat acutely + outpatient follow-up."

Panel 3 (Bottom): The chronic branch leads to "Assess psychiatric comorbidity & function" which connects to three assessment boxes: "Depression/Anxiety screening," "Functional impairment (school, activities)," and "Family/parental catastrophizing."

Panel 4 (Final): All three assessment boxes converge to a treatment box: "Multidisciplinary approach: CBT (first-line) + Consider amitriptyline/SNRIs + PT/OT + Parent training." An arrow loops back from this box with text "Avoid opioids; Goal = function not pain elimination."

Use simple boxes, clear arrows, and minimal text. Color-code acute pathway (red/orange) and chronic pathway (blue/green). </image>

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