What should you know about diverticulitis causes?

Diverticula are small outward pockets that can form in the wall of the large bowel. Diverticulosis means pockets are present without active inflammation. Diverticulitis begins when a pocket and nearby tissue become irritated and inflamed. Pressure inside the bowel, changes in stool movement, local blockage and the gut's normal bacteria may all be involved; one single food or event does not explain every episode. Learn about [Diverticular Disease](/conditions/diverticular-disease/) for the wider picture.

A person may have abdominal pain, fever, nausea, bloating or a change in bowel habit. Those symptoms can arise from several conditions, so a clinician uses the full history and examination rather than symptoms alone.

Record when symptoms began, where pain is located, bowel changes, fever, vomiting, recent medicines and foods that seem to aggravate symptoms. Arrange a [GP Consultation](/treatments/consultations-and-assessment/gp-consultation/) for new or recurring pain. A clinician can decide whether examination, blood tests or imaging is appropriate. After the acute problem is addressed, [Nutrition Counselling](/treatments/lifestyle-and-wellness/nutrition-counselling/) can support a sustainable eating and fibre plan suited to your symptoms.

Get urgent help for severe or worsening abdominal pain, persistent vomiting, a swollen or rigid abdomen, inability to pass stool or gas, fainting, confusion, or marked fever. Seek prompt advice for blood in the stool or symptoms that keep returning. Abdominal pain and constipation can be useful symptom terms when describing your concern; see [Abdominal Pain](/symptoms/abdominal-pain/) and [Constipation](/symptoms/constipation/).

Ask which findings support diverticulitis, whether another condition should be considered, what tests are needed, how to reduce recurrence risk, and which symptoms require same-day care.