Functional Integrative Health · Supplementary · from Functional Integrative Health

Case 2: Irritable Bowel Syndrome with Mind-Gut Therapy

Patient Presentation

Demographics: 29-year-old male software engineer

Chief Complaint: "My stomach has been a mess for three years and it's ruining my life."

History of Present Illness: The patient presents with a three-year history of alternating constipation and diarrhea with associated abdominal pain, bloating, and excessive gas. His symptoms began during a period of intense work stress and a relationship breakup. He reports that abdominal pain is typically crampy, located in the left lower quadrant, and partially relieved by defecation. Bowel habits alternate between 3-4 days of constipation followed by 2-3 days of loose stools (Bristol type 6-7).

He has previously been evaluated with a colonoscopy (normal), celiac panel (negative), and stool studies for infectious etiologies (negative). He was diagnosed with IBS-Mixed type and prescribed dicyclomine, which provided only partial relief. He reports that symptoms significantly worsen with work deadlines, travel, and social eating situations.

He has developed significant food anxiety and has progressively restricted his diet, eliminating dairy, gluten, soy, and most raw vegetables. Despite restrictions, his symptoms persist. He reports disrupted sleep, noting that he frequently wakes at 3-4 AM with abdominal discomfort. He endorses significant anxiety around meals and has begun avoiding social situations involving food.

Past Medical History:

• IBS-Mixed type (diagnosed 2 years ago)
• Generalized anxiety disorder
• Lactose intolerance (self-diagnosed)

Medications:

• Dicyclomine 20 mg as needed before meals
• Psyllium husk fiber supplement daily
• Probiotic (Lactobacillus/Bifidobacterium blend)

Social History:

• Non-smoker, 3-4 cups of coffee daily
• Alcohol: 4-6 beers on weekends
• Sedentary work, sits 10+ hours daily
• High-stress tech job with frequent deadlines
• Restrictive diet due to food fears

Family History:

• Mother: IBS, anxiety disorder
• Father: Peptic ulcer disease
• Maternal grandmother: Colon cancer at age 72

Physical Examination

• Vital Signs: BP 122/78 mmHg, HR 82 bpm, RR 16, Temp 36.8°C, SpO2 99% RA, BMI 22.1
• General: Thin, anxious-appearing male
• Abdomen: Mild distension, tympanic to percussion, tenderness to deep palpation in left lower quadrant, no rebound or guarding, hyperactive bowel sounds, no hepatosplenomegaly
• Rectal: Normal tone, no masses, stool guaiac negative
• Musculoskeletal: Tense paracervical and trapezius muscles bilaterally
• Psychiatric: Anxious affect, speaks rapidly, frequently mentions food fears

Workup and Results

Laboratory Studies:

Imaging/Additional Studies:

• Colonoscopy (1 year prior): Normal mucosa, random biopsies negative for microscopic colitis
• Abdominal ultrasound: No gallstones, normal liver and pancreas
• Lactulose breath test: Positive for SIBO with hydrogen peak at 60 minutes
• Validated questionnaires: GAD-7 score 14 (moderate anxiety), PHQ-9 score 8 (mild depression), IBS-SSS score 328 (severe)
• Visceral Sensitivity Index: 24/75 (significant GI-specific anxiety)

Clinical Image

Diagram of the bidirectional gut-brain axis showing vagal nerve communication, enteric nervous system signaling, microbiome-immune interactions, and the role of psychological stress in IBS symptom generation. Source: Educational illustration.

Diagnosis

Irritable Bowel Syndrome - Mixed Type (IBS-M) with Small Intestinal Bacterial Overgrowth (SIBO), GI-Specific Anxiety, and Dysregulated Gut-Brain Axis

Key Diagnostic Criteria:

• Rome IV criteria met: Recurrent abdominal pain at least 1 day/week for > 3 months, associated with defecation, change in stool frequency, and change in stool form
• Positive lactulose breath test confirming SIBO
• Normal inflammatory markers and fecal calprotectin excluding IBD
• Elevated morning cortisol suggesting chronic stress activation
• Low secretory IgA indicating mucosal immune compromise
• High IBS-SSS and Visceral Sensitivity Index scores indicating severe disease with significant brain-gut dysfunction

Treatment Plan

1. SIBO eradication: Rifaximin 550 mg TID for 14 days, followed by partially hydrolyzed guar gum (PHGG) 5 g daily as prokinetic prebiotic
2. Gut-directed psychotherapy: Referral for gut-directed hypnotherapy (7-session protocol) targeting visceral hypersensitivity and GI-specific anxiety
3. Dietary restructuring: Low-FODMAP elimination diet for 6 weeks with structured reintroduction guided by registered dietitian; gradual caffeine reduction to 1 cup daily; alcohol reduction to 2 drinks/week maximum
4. Mind-body interventions: Diaphragmatic breathing exercises before meals (5 minutes), progressive muscle relaxation at bedtime, cognitive behavioral therapy for food-related anxiety
5. Vagal tone enhancement: Cold water face immersion, gargling exercises, HRV biofeedback training 3x/week
6. Prokinetic support: Post-SIBO treatment low-dose prucalopride 1 mg at bedtime to prevent recurrence; ginger root extract 250 mg before meals
7. Follow-up: Repeat breath test at 8 weeks, IBS-SSS and GAD-7 reassessment at 12 weeks, dietitian review at 6 and 12 weeks

Key Learning Points

• IBS is a disorder of gut-brain interaction (DGBI), not merely a functional bowel problem; treatment must address both the peripheral and central components
• SIBO is present in up to 78% of IBS patients and should be tested for, as eradication can significantly improve symptoms
• Gut-directed hypnotherapy has Level A evidence for IBS with NNT of 4, comparable to any pharmaceutical intervention
• GI-specific anxiety and visceral hypersensitivity are powerful perpetuating factors that standard anxiolytic therapy alone does not adequately address
• Overly restrictive diets can worsen nutritional status and food-related anxiety; structured reintroduction with professional guidance is essential

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