By Dr Pranab Gyawali, Consultant Gastroenterologist
If you have Crohn’s disease or ulcerative colitis, and your test results look “perfect” — but you still feel bloated, gassy, or exhausted — you’re not alone.
One gut issue I see far too often — and that’s easy to miss but easy to treat — is SIBO (Small Intestinal Bacterial Overgrowth).
As a Dubai-based gastroenterologist, I often find my non-IBD patients are more aware of SIBO than my Crohn’s and colitis patients — yet the reality is, IBD patients are often at higher risk of SIBO than the average person.
So if your gut still doesn’t feel right, here’s what you should know.
What is SIBO and Why Does It Matter for IBD?
SIBO stands for Small Intestinal Bacterial Overgrowth. It happens when bacteria that normally stay in your large intestine move into your small intestine, where they don’t belong.
When these bacteria overgrow in the small bowel, they ferment food too early — producing excess hydrogen and methane gases.
Typical SIBO symptoms include:
- Bloating and uncomfortable fullness
- Excess gas, belching
- Cramping after meals
- Diarrhea or constipation
- Brain fog and fatigue
SIBO itself isn’t “part of” IBD — but the two often overlap. Many Crohn’s and UC patients have “normal” scopes and blood work yet feel unwell. Undiagnosed SIBO could be the reason.
Learn more about IBD care in Dubai
Why Are Crohn’s and Colitis Patients at Higher Risk?
If you have Crohn’s disease affecting the small bowel, you’re more likely to develop SIBO because:
- Previous bowel surgery can change gut flow
- Narrowing (strictures) slows digestion
- Slower motility allows bacteria to grow in the wrong place
Even in ulcerative colitis, if your gut motility slows or bacteria shift into the small bowel, SIBO can develop.
📊 Did you know? Studies show up to 40% of Crohn’s patients have SIBO in some form — yet it often goes undiagnosed.
How Do We Test for SIBO?
Here in my Dubai clinic, I use a Hydrogen & Methane Breath Test to check for SIBO.
How the breath test works:
1️⃣ Follow a short prep diet and overnight fast
2️⃣ Drink a sugar solution (lactulose or glucose)
3️⃣ Provide breath samples every 15–20 minutes for about 2 hours
4️⃣ The test machine measures gas levels — early spikes suggest bacterial overgrowth
It’s simple, non-invasive, and very effective for diagnosing SIBO.
Treating SIBO — The Good News
If your test is positive, SIBO is very treatable.
Most patients respond well to:
- A short course of targeted antibiotics
- Sometimes herbal antimicrobial therapy
- Temporary dietary changes (like a low-FODMAP diet)
- Support for gut motility if needed
One study showed 75% of IBD patients with SIBO saw real improvement after treatment.
FAQs: SIBO and IBD
What are the symptoms of SIBO if I have Crohn’s or UC?
Bloating, gas, cramping, loose stools, or fatigue — especially when your IBD tests look normal — may point to SIBO.
How do you test for SIBO in Dubai?
A simple hydrogen & methane breath test in my clinic can diagnose SIBO accurately.
Is SIBO common in Crohn’s or colitis?
Yes — studies suggest up to 40% of Crohn’s patients may have SIBO, especially if they’ve had surgery or small bowel involvement.
Where can I see a specialist for SIBO and IBD in Dubai?
I help patients manage Crohn’s, colitis, and gut health issues — including SIBO — with personalized, evidence-based care.
Final Thoughts
✅ If your gut doesn’t feel right — even when your IBD is “under control” — SIBO might be the missing piece.
It’s common. It’s easy to test for. And with the right treatment, it’s fixable.
Recommended Guides:
FMT, Probiotics and Next-Generation Microbiome Therapies
- AI in Crohn’s and Ulcerative Colitis: Can Machine Learning Predict IBD Treatment Response?
- FMT and infliximab in IBD: could the microbiome help biologics work better?
- Fecal microbiota transplant for Crohn’s disease and ulcerative colitis
- Probiotics for Crohn’s and ulcerative colitis: what actually works?
- Probiotics in ulcerative colitis: what does the MB310 trial mean?
- Engineered probiotic for ulcerative colitis 2026
- Probiotics for ulcerative colitis: what actually works?
Gut Microbiome, Diet and Treatment Response
- Diet and microbiome in IBD: how the right bacteria calm gut inflammation
- Gut microbiome in Crohn’s disease and ulcerative colitis
- How the Oxygen Trap may be driving your IBD, and why diet still matters
- IBD flare risk, diet and calprotectin
- IBD breakthrough: how gut bacteria unlock natural anti-inflammatories
- Gut microbiome test in Dubai
Crohn’s, Colitis and Biologic Treatment Strategy
- Learn about Biologicals used in UC and Crohn’s in Dubai
- Crohn’s disease specialist care in Dubai
- Ulcerative colitis specialist care in Dubai
- How biologics work in Crohn’s and colitis
- How we choose the right biologic for Crohn’s and UC in Dubai
- New omics research: predicting response to biologics in Crohn’s and ulcerative colitis
Investigations and Procedures
- Colonoscopy for Crohn’s and ulcerative colitis monitoring
- Capsule endoscopy for small bowel Crohn’s disease
- MRI abdomen and MR enterography
- CT abdomen and CT enterography
- Hydrogen and methane breath test for SIBO
If you wish to discuss this further or would like to make an appointment, please use the booking form on this page.