VHOSPITAL.CLINIC · Differential Diagnosis
Celiac Disease vs Irritable Bowel Syndrome (IBS)
Clinical comparison — shared symptoms, key differences, distinguishing diagnostic tests, treatment pathways, and when to seek urgent evaluation.
Condition Overview
Condition A
Celiac Disease
Celiac disease is an autoimmune reaction to gluten that damages the small intestine villi, impairing nutrient absorption. Symptoms include diarrhea, bloating, weight loss, and fatigue; strict gluten-free diet is the only treatment.
Condition B
Irritable Bowel Syndrome (IBS)
IBS is a functional gastrointestinal disorder causing recurrent abdominal pain related to defecation, with altered stool frequency or consistency. It affects up to 15% of the population; dietary changes, stress management, and symptom-specific medications help.
Shared Symptoms — Why They're Confused
Both conditions present with 3 overlapping symptoms, making clinical differentiation essential.
Key Clinical Differences
Celiac Disease
- Abdominal pain, bloating, and diarrhoea
- Symptoms related to food intake
- Fatigue
- Often misdiagnosed for years
Irritable Bowel Syndrome (IBS)
- Purely functional — no structural or mucosal damage
- No malabsorption or nutritional deficiencies
- Normal serology and small bowel biopsy
- Symptoms modulated by gut-brain axis and psychological factors
Distinguishing Diagnostic Tests
| Test | Celiac Disease | Irritable Bowel Syndrome (IBS) |
|---|---|---|
| Serum anti-tTG IgA + total IgA | Elevated anti-tTG IgA (with normal total IgA) — highly specific for coeliac | Normal serology — no autoimmune activation |
| Duodenal biopsy (OGD) | Villous atrophy, crypt hyperplasia, intraepithelial lymphocytosis (Marsh grade 3) | Normal histology |
| Faecal calprotectin | Mildly elevated in active coeliac disease | Normal (<50 μg/g) |
Treatment Approaches
Celiac Disease
- •Strict lifelong gluten-free diet
- •Nutritional supplementation (iron, B12, folate, vitamin D)
- •Annual follow-up with serology and DEXA
Irritable Bowel Syndrome (IBS)
- •Low-FODMAP diet
- •Antispasmodics (mebeverine, hyoscine)
- •Probiotics
- •CBT for gut-brain axis management
When Doctors Consider Each Diagnosis
🔵 Consider Celiac Disease when:
- →Diarrhoea with weight loss, iron/B12 deficiency, positive anti-tTG, villous atrophy on biopsy
🟢 Consider Irritable Bowel Syndrome (IBS) when:
- →Normal serology and biopsy, no nutritional deficiencies, stress-related symptoms, no weight loss
Explore Each Condition in Detail
Related Clinical Pages
Celiac Disease
Irritable Bowel Syndrome (IBS)
Medical References
Content on this page is informed by evidence-based clinical sources including:
- World Health Organization (WHO)Global health guidance and disease classification
- National Health Service (NHS)UK clinical guidelines and patient information
- National Institute for Health and Care Excellence (NICE)Evidence-based clinical practice guidelines
- Centers for Disease Control and Prevention (CDC)US public health data and clinical recommendations
- PubMed – NCBIPeer-reviewed biomedical literature and clinical studies
- Cochrane LibrarySystematic reviews and meta-analyses in evidence-based medicine
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