GPAtlas🧭 When to suspect
Faecal incontinence (FI) is any involuntary loss of solid or liquid stool that is a social or hygiene problem. Crucially, it is a symptom, not a diagnosis – there is almost always an identifiable, often reversible, contributory cause, and many patients have several at once.
It is common (affecting roughly 1–10% of community-dwelling adults) but profoundly under-reported: it carries real stigma, and some patients describe "diarrhoea" rather than name the problem. Active, sensitive case-finding therefore matters. The two priorities in primary care are simple: identify the pattern and the treatable cause, and never miss a red flag (colorectal cancer, cauda equina, or an acute obstetric sphincter injury).
| Pattern | Typical picture and the clue |
|---|---|
| Urge FI | Sudden, irresistible urge then leakage before reaching the toilet → weak external sphincter and/or loose stool. |
| Passive FI (soiling) | Leakage without awareness, often after defaecation → internal sphincter dysfunction, haemorrhoids or rectal prolapse. |
| Overflow FI | Loose/watery leakage around a hard impacted stool, typically in frail, immobile or constipated patients → the great mimic of "diarrhoea". |
| Functional / neurogenic | Reduced mobility or impaired sensation (stroke, MS, spinal injury, dementia) → cannot reach the toilet in time, or gets no warning. |
Actively raise suspicion in high-risk groups: frail older people; anyone with loose stools or diarrhoea from any cause; women after childbirth (especially third- or fourth-degree obstetric tears); neurological or spinal disease (stroke, multiple sclerosis [MS], spinal cord injury, spina bifida); severe cognitive impairment or learning disability; pelvic organ or rectal prolapse; previous anal/colorectal surgery or pelvic radiotherapy; coexisting urinary incontinence; or perianal soreness, itch or pain.
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🧠 Clinical pearl – most patients never volunteer it FI is one of the most under-disclosed symptoms in general practice – embarrassment is the rule, and some patients report "loose bowels" to avoid naming it. A direct but gentle question in any high-risk group ("Many people with this problem also have some trouble controlling their bowels – is that something that affects you?") uncovers a treatable problem that would otherwise stay hidden. |
Source: NICE CG49
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