Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.
Diverticulosis and symptomatic uncomplicated disease
Essential points for quick revision.
2 min synopsisUK scopeSources checked 8 Sept 2026Clinical review pending
Saved on this device
!
New features suggesting an acute complication
Constant escalating pain, fever, guarding, persistent vomiting, abdominal distension, substantial rectal bleeding or circulatory change is not symptomatic uncomplicated disease and needs urgent reassessment.
Action: Record observations, examine for peritonism or obstruction and arrange same-day secondary-care assessment; resuscitate active bleeding or sepsis while the relevant acute colorectal pathway is activated.
Synopsis
Diverticulosis describes colonic diverticula without inflammation; diverticular disease describes symptoms attributed to them after excluding cancer, colitis and other causes. Management emphasises fibre, hydration, activity and review of persistent or changing symptoms.
Diverticulosis means diverticula are present; symptomatic uncomplicated diverticular disease attributes chronic symptoms only after acute inflammation and important alternatives are excluded.
Intermittent left iliac fossa pain with constipation, diarrhoea or mucus may fit, but no symptom pattern proves that incidental diverticula are the cause.
Check prior colonic imaging for quality and date; new anaemia, weight loss, bleeding or persistent bowel-habit change requires a current cancer assessment.
Key red flags
Unintentional weight loss, iron-deficiency anaemia, an abdominal or rectal mass, or a persistent new bowel-habit change requires colorectal cancer assessment even when diverticula are already documented.
Fever with constant focal pain or guarding suggests acute diverticulitis, while vomiting and distension raise concern for obstruction.
Large-volume painless haematochezia, syncope or haemodynamic change should be treated as acute lower gastrointestinal bleeding.
Investigation priorities
01
Previous colon imagingFirst step
confirm the presence and distribution of diverticula.
Management branches
Worked case: chronic symptoms with reassuring reassessmentConfirm an uncomplicated pattern and measure response
A 64-year-old with sigmoid diverticula documented on a complete, well-prepared colonoscopy 18 months ago has intermittent left-sided discomfort relieved by stool and constipation. Temperature is 36.7°C, abdomen is soft, haemoglobin is 142 g/L and CRP is 2 mg/L; there is no bleeding or weight loss.
Verify that pain remains intermittent and linked to bowel function, and ask specifically about nocturnal symptoms, bleeding, fever, vomiting, weight change and family history.
Review the original colonoscopy for caecal intubation, bowel preparation and the absence of a lesion rather than accepting a problem-list label of diverticulosis.
Key medicines
Paracetamol for uncomplicated diverticular painFor the cited 500 mg effervescent product in an adult aged at least 16 years, weighing more than 50 kg and with normal renal function, dissolve the tablet completely in a full tumbler of water and give 500–1000 mg orally every 6 hours when necessary, maximum 4 g in 24 hours. If GFR is 10–50 mL/min use 500 mg every 6 hours; if GFR is below 10 mL/min use 500 mg every 8 hours.Check all combination products to prevent duplicate paracetamol, and reduce or avoid dosing in low body weight, liver disease, malnutrition, dehydration or chronic excess alcohol use; overdose can cause fatal hepatic injury. This effervescent product contains 463.01 mg sodium per tablet, so include that load when sodium restriction matters. Repeated or escalating analgesic use requires clinical review of the diagnosis rather than unsupervised continuation.
National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 8 Sept 2026; clinical approval remains outstanding.