Totally fair question—those names are confusingly similar.
In short:
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Diverticular disease (or ‘diverticulosis’) = having the pouches
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Diverticulitis = the pouches are inflamed or infected
Here’s the breakdown 👇
Diverticular disease
This is the umbrella term.
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What it is: Small bulging pouches (diverticula) in the wall of the colon.
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How common: Very common, especially as people get older.
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Symptoms: Often none at all. Some people get bloating, constipation, or mild abdominal discomfort.
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Problem level: Usually not dangerous by itself.
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Management: High-fibre diet, fluids, lifestyle changes.
Note. Some people use ‘diverticulosis’ to mean the same thing – i.e. diverticular disease without inflammation.
Diverticulitis
This is a complication of diverticular disease.
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What it is: One or more diverticula become inflammed or infected.
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Symptoms:
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Persistent abdominal pain (classically left lower abdomen)
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Fever
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Nausea or vomiting
- Bleeding PR
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Changes in bowel habit (constipation or diarrhoea – or alternating)
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Problem level: Can be serious.
- Complications: A diverticulum can perforate (presenting as peritonitis and acute abdomen), bleed or form a mass or abscess. These usually require surgery.
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Treatment: May need antibiotics, bowel rest, or hospitalisation (and surgery) in severe cases.
Note. Diverticulitis is one or the differential (alternative) diagnoses for bowel cancer.
Key differences
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Diverticular disease: Pouches present, usually mild or silent
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Diverticulitis: Inflammed/infected pouches, painful, needs treatment
🚨 When to get medical help:
If someone with known diverticular disease develops constant abdominal pain, fever, or worsening symptoms, they should get checked – diverticulitis can lead to an abscess or perforation if untreated.
