Pouches in the bowel wall, present in most people over 70. Common, usually silent, and widely misunderstood.
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Diverticula are small pouches that push out through weak points in the wall of the large bowel. They are extraordinarily common — present in around half of people over 50 and most people over 70 — and in the great majority they cause no trouble at all.
The single most useful thing on this page is a correction: you can eat nuts, seeds, popcorn and sweetcorn.
For decades people were told to avoid them, on the theory that a small hard fragment might lodge in a pouch and cause inflammation. Large prospective studies have since found no increased risk — if anything a slightly lower one. A great many people have avoided these foods for twenty years for no reason, and some have restricted their diet considerably. You can stop.
The second thing is about fibre timing, which is genuinely confusing. A high-fibre diet helps prevent flares and is recommended between them. During an acute attack, the opposite applies — you rest the bowel with low-fibre food or fluids, then build fibre back up as things settle. People get this the wrong way round and make themselves worse.
Three words worth separating: diverticulosis means the pouches are simply there. Diverticular disease means they cause symptoms. Diverticulitis means one has become inflamed or infected.
Most people with diverticula never know. They are commonly found by chance during a colonoscopy or a scan done for another reason, and finding them is not a diagnosis of disease.
It overlaps considerably with irritable bowel syndrome, and telling them apart is not always straightforward.
Sudden, painless bleeding from the back passage, which can be substantial. Bright or dark red blood, often quite a lot of it, usually stopping by itself.
It is alarming and it needs assessing — both because of the volume and because blood from the bowel must never be assumed to be diverticular.
Pressure inside the bowel pushes the inner lining out through weak points where blood vessels penetrate the muscle wall. Low fibre intake, and the harder, smaller stools that go with it, mean the bowel has to generate higher pressures to move contents along.
Nuts, seeds, popcorn and sweetcorn. This was believed for decades and has been examined properly in large studies. No increased risk was found, and consumption was associated with slightly lower risk.
If you have been avoiding these, you can eat them again — and given they are high in fibre, doing so probably helps.
The NSAID and opioid association is worth taking seriously. If you have diverticular disease and take ibuprofen or naproxen regularly, that is worth reviewing — paracetamol is the safer choice here.
Colonoscopy is avoided during an acute attack because of the risk of perforation. It is done afterwards, once things have settled.
After an episode of diverticulitis, colonic investigation is usually recommended within a few weeks to exclude cancer, particularly after a complicated episode or a first presentation.
This step gets forgotten, especially when someone was managed at home. It is worth asking about directly.
Much of this can be managed remotely, and the important thing is knowing where the line sits.
Acute diverticulitis needs an abdomen felt. We will say so straight away rather than working through a consultation that ends the same way.
This is the most important warning here. Rectal bleeding, a persistent change in bowel habit, unexplained weight loss or iron deficiency anaemia must be investigated on their own merits.
Bowel cancer and diverticular disease affect the same age group and produce overlapping symptoms, and "it's just my diverticulitis" is a recognised route to a late diagnosis. Say so plainly if you feel a symptom is being attributed rather than investigated.
Most people who have one episode of diverticulitis never have another. Around a quarter have a recurrence.
Surgery is now reserved for complications or genuinely frequent, disabling attacks — the threshold has risen considerably, and routine removal after two episodes is no longer standard practice.
If you have rectal bleeding or a persistent change in bowel habit, use the NHS urgent pathway. It is quicker than any private route and it is designed for exactly this.
This page follows NICE guideline NG147 on diverticular disease, NICE guideline NG12 on suspected cancer referral, and NICE Clinical Knowledge Summaries.
The historical advice to avoid nuts, seeds and popcorn was based on theory rather than evidence. Large prospective cohort studies found no increased risk of diverticulitis or diverticular bleeding with their consumption, and NICE guidance no longer recommends avoidance.
Reviewed against NICE NG147, NG12 and NICE CKS guidance current at the date shown above.
Yes. The old advice was wrong and has been withdrawn. Large studies found no increased risk — in fact slightly less.
If you have been avoiding them for years, you can stop, and since they are high in fibre, eating them probably helps.
More between flares, less during one. This is the bit that confuses people most.
High fibre prevents attacks; during an attack you rest the bowel with low-fibre food or fluids, then build back up over a week or two.
No — NICE now supports managing uncomplicated diverticulitis without them in people who are otherwise well.
They are needed if you are systemically unwell, immunosuppressed, or have other significant health problems.
Paracetamol. Ibuprofen, naproxen and opioids all increase the risk of perforation in diverticular disease.
If you take NSAIDs regularly for something else, that is worth reviewing — and it rarely gets mentioned.
No. Diverticulosis means the pouches are simply present, which is true of most people over 70 and causes nothing.
Diverticulitis means one has become inflamed or infected — a different situation entirely.
Do not assume so. Diverticula do bleed, often painlessly and sometimes heavily — but bowel cancer affects the same age group.
Rectal bleeding needs investigating on its own merits, every time.
Probably not. Most people who have one episode never have another, and only around a quarter have a recurrence.
Surgery is now reserved for complications or frequent disabling attacks — routine removal after two episodes is no longer standard.
Fever, worsening pain, or feeling genuinely unwell rather than just sore. Those need an abdomen examined and often a scan.
A mild flare should improve within 48 to 72 hours — if it is not, get seen.
No, though they overlap and can coexist. IBS does not cause fever, bleeding or inflammation.
Telling them apart matters, because the treatment differs and one can mask the other.
Usually yes, a few weeks afterwards, to make sure nothing else is going on.
This step is frequently forgotten when someone was treated at home — ask directly whether it has been arranged.
August 30, 2026
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