Bowel leakage: causes, red flags and when to get it checked

Continence depends on stool consistency, the sensation of rectal fullness, the strength of the anal sphincter muscles, and the nerves linking them. A problem with any of these, such as loose stool, a damaged sphincter or reduced sensation, can cause leakage.

• Diarrhoea and urgency from IBS, infection, medicines, inflammatory bowel disease or food intolerance.

• Constipation with overflow, where soft stool leaks around a hard mass, common in older and less mobile people.

• Sphincter damage after childbirth, especially with forceps or tears, or after anal surgery.

• Weak or poorly coordinated pelvic floor muscles with ageing, menopause or chronic straining.

• Rectal prolapse, haemorrhoids and haemorrhoid treatment.

• Neurological conditions: diabetes, multiple sclerosis, stroke, spinal injury or dementia.

• Radiotherapy to the pelvis and previous bowel surgery.

• Cauda equina syndrome, and rarely, rectal cancer, which are less common but important.

New loss of bowel and bladder control with back pain, numbness in the saddle area or leg weakness, blood in stool, unintended weight loss, a change in bowel habit over 50, severe constipation with vomiting and distension, or leakage after pelvic radiotherapy need prompt assessment.

• Call 999 or go to A&E: new bowel and bladder incontinence with back pain, numbness between the legs or leg weakness.

• Urgent GP referral: leakage with rectal bleeding, weight loss or a bowel habit change, particularly over 50.

• GP within weeks: persistent leakage affecting daily life.

• Routine: occasional leakage with diarrhoea that resolves with the illness.

The doctor asks about frequency, type, awareness, stool consistency, urgency, constipation, childbirth and surgery history, diet, medicines, other medical conditions and impact on life. They examine the abdomen and perform a rectal examination to assess sphincter tone, impacted stool and prolapse.

• Blood and stool tests: to look for infection, inflammation and anaemia.

• Anorectal manometry: measures sphincter pressure and sensation.

• Endoanal ultrasound: shows sphincter damage.

• Colonoscopy or sigmoidoscopy: for bleeding, bowel habit change or suspected bowel disease.

• MRI of the pelvis or spine: if structural or neurological causes are suspected.

Keep a bowel diary, adjust diet and fluids to firm stools, review caffeine, sweeteners and alcohol, and consider fibre or loperamide under advice. Pelvic floor exercises, ideally taught by a specialist physiotherapist, help many people. Skin care with barrier creams and planning toilet access improve comfort and confidence.

The NHS route is a GP and local continence service, then colorectal or gynaecology specialists. Private colorectal and pelvic floor clinics offer direct access to manometry, ultrasound and biofeedback.