Celiac Disease vs IBS: How to Tell If It's Gluten Sensitivity or Something Else

Celiac Disease vs IBS: How to Tell If It's Gluten Sensitivity or Something Else

By Dr. Onikepe Adegbola, MD PhD — Johns Hopkins-trained physician-scientist

The symptoms of celiac disease and IBS are nearly identical: bloating, diarrhea, abdominal pain, and fatigue. But celiac is an autoimmune disease that causes measurable intestinal damage, while IBS is a functional disorder with no structural changes. Getting the diagnosis right changes everything.

Key Takeaways

• Celiac disease affects ~1% of the population but is undiagnosed in most cases
• Blood test (tTG-IgA) is the first screening step — must be eating gluten for accurate results
• Non-celiac gluten sensitivity (NCGS) is real but poorly understood — no test exists
• Many "gluten sensitivity" cases are actually FRUCTAN sensitivity (wheat's FODMAP, not its protein)
• Both conditions benefit from digestive enzymes and probiotics

Comparison

What to Do

1. Get tested for celiac BEFORE going gluten-free — blood test requires active gluten consumption
2. If celiac-negative but wheat-sensitive: Try low FODMAP (targeting fructans, not gluten)
3. Support digestion either way: FODMAP enzymes with meals + daily probiotic
4. Rebuild gut barrier: Psyllium fiber for SCFA production

See our SIBO vs IBS guide and FODMAP reintroduction protocol.

This article is educational only. Celiac disease diagnosis requires medical testing.