Health condition
Small bowel diverticulosis
Small bowel diverticulosis - pouches in the jejunum or ileum - is usually silent but can cause bloating and malabsorption through bacterial overgrowth, and occasionally bleeds, perforates or obstructs; recognition spares patients years of unexplained symptoms.
Why trust this guide
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Editorial team
Written by our editorial team from the UK sources listed on each page.
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Sourced from guidance
Checked against current NHS and UK specialist society guidance at the time of review.
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Current for 2026
Reviewed on 2026-09-27 with the next review scheduled for 2027-09-27.
Key points
What matters most, at a glance.
The essentials in plain English - symptoms, when to seek help, who to see and what treatment looks like.
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Most cases are incidental findings on CT or MRI performed for other reasons
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Bacterial overgrowth in the pouches causes bloating, diarrhoea, weight loss and B12 deficiency - and responds to antibiotic courses
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Complications - diverticulitis, bleeding, perforation or obstruction - are uncommon but can mimic other abdominal emergencies
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Sudden severe abdominal pain with fever or a rigid abdomen is an emergency - seek same-day care
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Surgery is reserved for complications, not for the mere presence of diverticula
Understanding it
About Small bowel diverticulosis, and what to do next.
These pouches herniate at the points where blood vessels pierce the bowel wall, often in association with underlying motility abnormalality of the small intestine. Their clinical importance is usually indirect: stagnant loops harbour excess bacteria, which consume B12, deconjugate bile salts and generate the gas and diarrhoea patients notice.
Where overgrowth is suspected, cyclical antibiotic therapy alongside nutritional correction transforms symptoms; breath testing or empirical treatment are both reasonable routes. Complicated disease - bleeding from a jejunal diverticulum can be brisk - is managed at centres with enteroscopy and surgical backup. Most people start with their GP, who can refer to a consultant gastroenterologist. In many parts of the UK, routine NHS referrals for this kind of problem currently take 20-45+ weeks, whereas an initial private consultation is typically available within around two weeks.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them - and seek urgent care for any emergency symptoms described above.
Frequently asked
Common questions about Small bowel diverticulosis.
Quick, plain-English answers to what people ask us most.
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What is small bowel diverticulosis?
Small bowel diverticulosis is a medical condition that can affect people differently depending on severity, underlying cause and overall health. A clinician can confirm the diagnosis and explain what it means specifically for you.
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Why does small bowel diverticulosis happen?
Causes vary and can include genetic, environmental, lifestyle and other health-related factors, and in some people no single clear cause is found. Your clinician can help identify anything relevant to your own case.
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How would I know if I have small bowel diverticulosis?
Symptoms vary between individuals and depend on which body systems are affected and how significant the underlying problem is. Keeping track of what you notice, and when, helps your clinician assess it accurately.
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How worried should I be about small bowel diverticulosis?
Severity varies from mild and self-limiting to more significant, depending on the underlying cause and how it's managed. A clinical assessment is the best way to understand what it means in your specific situation.
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Is small bowel diverticulosis hereditary or genetic?
This depends on the specific condition — some cases have a genetic or familial component, while others are linked more to environmental, lifestyle or other health factors. If you have a relevant family history, it's worth mentioning to your clinician.
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Is there a cure for small bowel diverticulosis?
Many cases can be effectively treated or managed, and prevention strategies exist for some causes, though this depends on the specific underlying reason in your case. Your clinician can explain what's realistic for you.
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How is small bowel diverticulosis treated?
Treatment is tailored to the underlying cause and severity, and can range from simple lifestyle or self-management measures to medical or specialist intervention.
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What is the long-term outlook for small bowel diverticulosis?
This varies depending on the underlying cause, how early it's identified, and how well it responds to treatment — your clinician can give a more specific expectation once assessed.
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When should specialist referral be considered for small bowel diverticulosis?
Specialist referral is worth considering if symptoms persist, are getting worse, or aren't responding to initial treatment — your GP can help decide the right pathway and urgency.
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When should I see a doctor about small bowel diverticulosis, and how quickly can I be seen privately?
See a doctor if symptoms are persistent, worsening, or affecting your daily life — earlier assessment generally leads to better management. NHS routine referrals for this kind of concern often take 20–45 weeks or longer depending on the area, while a private consultant can typically see you within about 2 weeks, with faster access to scans and specialist opinion.