IBS vs SIBO: What’s the Difference (and Why It Matters)

IBS is a diagnosis many people receive when they have chronic digestive symptoms—but it doesn’t explain the root cause. SIBO is one possible driver of IBS-like symptoms. Here’s how to think about IBS vs SIBO and what to do if you’re stuck.

IBS: a symptom-based diagnosis

IBS (irritable bowel syndrome) is diagnosed based on symptoms like abdominal pain, bloating, constipation, and/or diarrhea. It doesn’t tell you why the symptoms are happening.

SIBO: one potential root cause

SIBO is an overgrowth of bacteria in the small intestine. It can cause IBS-like symptoms and may be linked with nutrient deficiencies, inflammation, and food intolerances.

Clues that SIBO may be involved

• Bloating soon after meals

• Symptoms that flare with high-FODMAP foods

• History of food poisoning or gut infections

• Symptoms that return after temporary improvement

• Reflux, nausea, or significant gas

Why the distinction matters

When you identify drivers (like motility issues, stress physiology, or bacterial overgrowth), your plan becomes more targeted—and often more sustainable than long-term restriction.

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