What triggers a diverticulitis flare?

Diverticulitis flares — when pouches in the bowel wall become inflamed or infected — are not always predictable, but common associated factors include constipation, low fibre intake, dehydration, certain NSAIDs, and possibly red meat consumption. The previous belief that nuts and seeds cause flares has not been supported by research; high-fibre diets are now recommended for prevention.

What diet is recommended after a diverticulitis episode?

During an acute flare, a low-residue or liquid diet reduces mechanical stress on the affected bowel while healing occurs. Once the flare resolves, gradually reintroducing fibre — with adequate hydration — supports long-term remission. A high-fibre diet rich in vegetables, legumes, and whole grains significantly reduces the risk of recurrent diverticulitis.

Can probiotics help with diverticular disease?

Some evidence suggests that specific probiotic strains may reduce the frequency of diverticulitis flares and associated symptoms including bloating and abdominal pain. Lactobacillus casei and multi-strain formulations have been studied. While the evidence is not yet definitive, the risk of probiotic use is low and benefits are plausible given the role of gut microbiome in bowel inflammation.

Digestivemoderate Risk

Diverticulitis

Inflammation or infection of small pouches in the digestive tract.

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Reviewed by Dr. Ciara Magee · Integrative Midwifery26 March 2026Research-supported

Quick answer

Diverticulitis is the inflammation or infection of small pouches (diverticula) that form in the digestive tract wall, causing abdominal pain, fever, and changes in bowel habit. Dietary management, stress reduction, and gut microbiome support are used alongside medical treatment during recovery.

Do any of these feel familiar?

Diverticulitis typically begins with a sharp or cramping pain in the lower left abdomen that can come on suddenly or build over hours
Many people also notice bloating, nausea, and a change in bowel habits — either constipation or looser stools than usual
Fever and a general feeling of being unwell are common during a flare
Between episodes, some people experience ongoing lower abdominal discomfort or a sensitivity to certain foods
Many describe anxiety around eating and a constant low-level worry about when the next flare might occur

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IBS

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