Irritable Bowel Syndrome vs Celiac Disease
Irritable Bowel Syndrome and Celiac Disease are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.
Irritable Bowel Syndrome vs Celiac Disease at a glance
- Irritable Bowel Syndrome: Disorder of gut-brain interaction with recurrent abdominal pain and altered bowel habits without structural disease.
- Celiac Disease: Immune-mediated small bowel injury triggered by dietary gluten in genetically susceptible (HLA-DQ2/DQ8) individuals.
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Side-by-side comparison
| Feature | Irritable Bowel Syndrome | Celiac Disease |
|---|---|---|
| At a glance | Disorder of gut-brain interaction with recurrent abdominal pain and altered bowel habits without structural disease. | Immune-mediated small bowel injury triggered by dietary gluten in genetically susceptible (HLA-DQ2/DQ8) individuals. |
| Classic presentation | Young woman with chronic abdominal pain relieved by defecation, alternating bowel habit, and bloating — exam normal.; Recurrent abdominal pain related to defecation (relief or worsening); Change in stool frequency or form; Bloating, distension; Mucus in stool; Symptoms worsened by stress and certain foods (FODMAPs); Sensation of… | Iron-deficiency anemia or osteoporosis in an adult without obvious cause — test for celiac disease.; Classic/GI: chronic diarrhea, steatorrhea, abdominal pain, bloating, flatulence, weight loss; Non-classic/atypical: iron-deficiency anemia (most common adult presentation), osteoporosis, infertility, recurrent miscarriage, neurologic… |
| Workup / key labs | Rome IV: Recurrent abdominal pain on average ≥1 day/week in the last 3 months, associated with ≥2 of: (1) related to defecation, (2) change in stool frequency, (3) change in stool form. Symptom onset ≥6 months prior to diagnosis. Subtypes by predominant stool form using Bristol Stool Scale: IBS-C, IBS-D, IBS-M, IBS-U.; CBC (exclude… | Adults: positive serology (tTG IgA with normal total IgA, or EMA, or DGP) + duodenal biopsy showing Marsh II-IV changes on a gluten-containing diet + clinical response to GFD. Children: ESPGHAN allows non-biopsy diagnosis if tTG IgA >10× ULN + positive EMA on separate sample + HLA-DQ2/DQ8.; Anti-tissue transglutaminase IgA (tTG IgA) —… |
| Imaging | Colonoscopy — NOT routinely required for typical IBS without alarm features; perform if age ≥45 (CRC screening), alarm features, family history of IBD/CRC, or refractory symptoms; Random colonic biopsies if chronic watery diarrhea (microscopic colitis) | Upper endoscopy with multiple duodenal biopsies — REQUIRED for diagnosis in adults: 1-2 from bulb + ≥4 from second/third portion; findings: scalloping of folds, mosaic pattern, decreased folds; Histology: increased intraepithelial lymphocytes (>25 per 100 enterocytes), crypt hyperplasia, villous atrophy (Marsh classification 0-IV);… |
| First-line treatment | Establish therapeutic relationship; educate that IBS is a real, chronic, manageable condition; Dietary modification: regular meals, adequate fiber (soluble — psyllium); trial of low-FODMAP diet under dietitian guidance; Exercise, sleep hygiene, stress management; Cognitive behavioral therapy and gut-directed hypnotherapy (strong evidence) | STRICT LIFELONG GLUTEN-FREE DIET — only proven treatment; Avoid wheat, rye, barley, malt; oats often tolerated (must be uncontaminated); Referral to registered dietitian experienced in celiac disease; Treat nutritional deficiencies: iron, B12, folate, vitamin D, calcium, zinc; DEXA scan at diagnosis; supplement vitamin D and calcium;… |
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