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Faecal incontinence in adults
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Exam Tips
- In OSCEs, classify leakage pattern (urge vs passive vs overflow) and link each to likely mechanism.
- Always include a sensitive medication review and ask specifically about laxatives, SSRIs, antibiotics, digoxin, and orlistat.
- Digital rectal examination findings (tone, squeeze, loading) are high-yield and often change management immediately.
- Use the Bristol Stool Chart image in history stations to improve stool description reliability.
- Remember red flags (rectal bleeding, weight loss, anaemia, new change in bowel habit, severe pain, neurological deficits) that mandate urgent colorectal/neurological assessment.
Definition
Faecal incontinence in adults is the involuntary loss of faeces that leads to social or hygiene problems. It is a clinical symptom/sign rather than a diagnosis, and usually reflects one or more underlying problems involving stool consistency, anorectal structure/function, neurological control, cognition, mobility, or access to toileting.
Pathophysiology
Continence depends on coordinated rectal sensation, rectal compliance, stool consistency, internal/external anal sphincter tone, pelvic floor support, cognition, and timely toilet access. Incontinence occurs when this system fails: loose stool can overwhelm otherwise intact sphincters, sphincter injury (for example obstetric anal sphincter injury) reduces closure pressure, neuropathy or spinal/central neurological disease impairs sensation and voluntary squeeze, and faecal impaction can cause overflow leakage around hard stool. Age-related frailty, reduced mobility, cognitive impairment, and environmental barriers further convert physiological vulnerability into clinical incontinence.
Risk Factors
- Older age and frailty (especially care-home residents)
- Loose stools or chronic diarrhoea from any cause
- Neurological disease or injury (stroke, multiple sclerosis, spinal cord injury, spina bifida)
- Severe cognitive impairment or learning disability
- Urinary incontinence
- Pelvic organ prolapse or rectal prolapse
- Previous anal surgery, colonic resection, or perianal trauma
- Pelvic radiotherapy
- Obstetric history including difficult delivery, large birth weight, third- or fourth-degree tear
- Diabetes mellitus (autonomic/peripheral neuropathy risk)
- Obesity
- Perianal soreness, pain, or itching
- Medications that worsen diarrhoea or reduce sphincter tone (for example laxatives, SSRIs, some antibiotics, digoxin, orlistat, nitrates, calcium-channel blockers, beta-blockers, sildenafil)
Clinical Features
Symptoms
- Involuntary leakage of liquid or solid stool (liquid leakage is often more frequent)
- Urgency with inability to defer defecation
- Passive leakage without awareness
- Post-defecation soiling
- Flatus incontinence
- Variable stool form (use Bristol Stool Chart image reference for history taking)
- Straining, incomplete evacuation, need for manual assistance, or repeated cleaning after bowel motion
- Associated bowel symptoms: diarrhoea, constipation, abdominal bloating/pain, mucus or rectal bleeding
- Major psychosocial impact: embarrassment, social withdrawal, anxiety/depressive symptoms, sexual and occupational impact
Signs
- Perianal skin erythema, excoriation, dermatitis, or soreness
- Faecal soiling of underwear/perineum
- Reduced resting tone or weak voluntary squeeze on digital rectal examination
- Faecal loading/impaction on rectal examination (overflow pattern)
- Perineal descent or pelvic floor weakness
- Rectal or pelvic organ prolapse
- Scars/deformity suggesting previous obstetric or anorectal trauma/surgery
- Neurological deficits affecting lower limbs/perineal sensation in neurogenic cases
Investigations
Focused history with bowel diary and Bristol Stool Chart documentation:Defines frequency, triggers, urgency, stool type, and pattern (urge, passive, or overflow incontinence)
Digital rectal and anorectal examination:Assesses resting tone, squeeze pressure, faecal loading, prolapse, and perianal skin damage
Medication and dietary review:Identifies iatrogenic causes (for example laxatives, SSRIs, broad-spectrum antibiotics, orlistat) and food triggers
Blood tests when clinically indicated (FBC, CRP, U&E, TFT, glucose, coeliac serology):May reveal inflammatory, endocrine, metabolic, or malabsorptive contributors to diarrhoea/incontinence
Stool tests when diarrhoea or red flags present:Can identify infection (including C. difficile where appropriate) or inflammatory pathology
Endoscopic/colorectal investigation for alarm features:Excludes colorectal neoplasia, IBD, radiation injury, or other structural disease
Specialist anorectal physiology and imaging (endoanal ultrasound/manometry):Demonstrates sphincter defects, reduced pressures, sensory dysfunction, and guides procedural planning
Management
Lifestyle Modifications
- Ask proactively but sensitively; normalize discussion because under-reporting is common
- Treat reversible causes first: diarrhoea, constipation with overflow, medication adverse effects, and toileting barriers
- Optimize stool consistency: regular meals, adequate hydration, tailored fibre (often soluble fibre), reduce trigger foods/caffeine/alcohol if contributory
- Bowel habit retraining and scheduled toileting; improve toilet access, privacy, clothing adaptability, and caregiver timing
- Pelvic floor muscle training, bowel retraining, and biofeedback via continence specialists
- Skin care with gentle cleansing, barrier creams, and appropriate continence products
- Smoking cessation and weight optimization where relevant
Pharmacological Treatment
Antimotility agent
- Loperamide 2 mg capsules: usual adult start 2 mg once or twice daily for chronic symptoms, titrate to effect; alternative acute-style regimen 4 mg initially then 2 mg after each loose stool (max 16 mg/24 h)
Useful when loose stool predominates. Avoid in acute severe colitis, suspected C. difficile or dysentery, bowel obstruction, or if abdominal distension develops (risk of ileus/toxic megacolon).
Bulking/fibre regulation
- Ispaghula husk 1 sachet once or twice daily (with adequate fluid), titrated to stool consistency
Can improve stool form in mixed bowel habit; ensure hydration to reduce risk of obstruction.
Management of overflow from faecal impaction
- Macrogol compound oral powder: disimpaction regimen often 8 sachets daily for up to 3 days (per product protocol), then maintenance lower dose
Indicated when rectal loading/impaction causes overflow leakage; review electrolytes and frailty context.
Surgical / Interventional
- Sacral nerve stimulation for selected refractory cases
- Sphincter repair (especially for defined obstetric sphincter injury, with awareness that benefit may decline over time)
- Sphincter replacement procedures in specialist centres
- Antegrade/retrograde irrigation programmes in selected patients
- Defunctioning stoma for severe refractory incontinence (often high symptom-control success and quality-of-life gain when carefully selected)
Complications
- Perianal dermatitis, excoriation, and skin breakdown
- Depression, anxiety, poor self-image, and relationship strain
- Social isolation and reduced participation in work/leisure/sexual activity
- Increased caregiver burden
- Financial strain due to continence product use and reduced employment
- Loss of independent living and possible nursing-home placement
Prognosis
Outcome depends on cause and comorbidity burden. Mild disease frequently improves with conservative measures (diet/stool optimization, medication review, antimotility therapy, pelvic floor and bowel retraining), while refractory cases may require specialist interventions; complete continence is not always achievable, and some patients continue to need pads or long-term support.
Sources & References
🏥BMJ Best Practice(2)
💊BNF Drug References(1)
- Loperamide hydrochloride[management.pharmacological]
✅NICE Guidelines(1)
- Faecal incontinence in adults[overview]
📖Textbook References(20)
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 927)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1271)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 715)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1774)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 706, 707)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1835)[context]
- [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 42, 43)[context]
- [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 72, 73)[context]
- [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 894)[context]
- [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 78)[context]
- [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 73)[context]
- [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 891)[context]
- [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 491, 492)[context]
- [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 139)[context]
- [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 1264, 1265)[context]
- [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 1167)[context]
- [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 1194, 1195)[context]
- [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 1194, 1195)[context]
- [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 1264, 1265)[context]
- [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 488)[context]