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🌊 The Ocean Library · GP clinical topic

Constipation in adults

Written and reviewed by practising UK GPs, overseen by our Clinical Advisory Officer. Last updated 17 Dec 2025.

🧭 When to suspect

Constipation is unsatisfactory defecation – infrequent stools, difficult or painful passage, or a sense of incomplete emptying. It is best thought of as a symptom, not a disease, and what counts as "normal" varies widely (anything from three times a day to three times a week). It is common, affecting roughly 1 in 7 adults, and is more frequent in women, older people, and during pregnancy.

The single most useful split is functional (primary/idiopathic) constipation – the large majority – versus secondary constipation caused by a drug or an underlying condition. The two clinical skills that matter in primary care are therefore: exclude red flags and reversible causes, then treat with lifestyle measures and a titrated laxative. Most cases need no investigation at all.

Suspect constipation when two or more are present

Fewer than three bowel movements per week

Hard or lumpy stools – Bristol Stool Form Scale type 1–2

Excessive straining to pass stool

Sensation of incomplete evacuation or anorectal blockage

Need for manual manoeuvres (digitation, perineal support) to pass stool

Symptoms persisting longer than three months define chronic constipation. New, persistent constipation in anyone over 50 – or at any age with weight loss, bleeding, or anaemia – needs active exclusion of malignancy before being labelled functional.

Source: NICE


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