Fecal incontinence is the accidental passing of solid stool, liquid stool, or mucus from the anus. It affects roughly 8.3% of U.S. adults, making it far more common than most people realize. Many people never bring it up with a doctor out of embarrassment, but effective treatments exist for nearly every cause.
Types of Fecal Incontinence
Not all bowel leakage feels the same, and the type you experience points toward different underlying problems.
Urge incontinence is the most common form. You feel a sudden, strong need to have a bowel movement but can’t make it to the bathroom in time. This typically happens when the pelvic floor muscles are too weak to hold back stool, often due to muscle injury or nerve damage.
Passive incontinence is leakage that happens without any warning or sensation at all. Your body simply doesn’t register that the rectum is full. This form is often linked to problems with the internal anal sphincter or nerve signaling issues that prevent you from feeling stool in the rectum.
How Common It Is
Prevalence rises steadily with age. Among adults in their 20s, about 2.6% experience fecal incontinence. By age 70 and older, that number climbs to 15.3%. Men and women are affected at similar rates (7.7% and 8.9%, respectively), which surprises many people who assume it’s primarily a women’s health issue. Childbirth-related injuries do make it more common in younger women, but as both sexes age, the gap narrows considerably.
Common Causes
The anal sphincters, rectum, and pelvic floor muscles work together to hold stool in place and release it at the right time. Damage or weakness anywhere in that system can lead to leakage.
Vaginal childbirth is one of the most common causes in women, particularly deliveries involving forceps or a surgical cut to widen the vaginal opening. These injuries can tear the ring-shaped muscles around the anus without being immediately obvious. Symptoms sometimes don’t appear until years later, when age-related muscle weakening compounds the original damage.
Nerve damage is the other major category. Conditions like diabetes, multiple sclerosis, Parkinson’s disease, stroke, and dementia can all disrupt the nerve signals between the brain and the muscles that control bowel function. Spinal cord injuries and surgical nerve damage can have the same effect.
Chronic straining during bowel movements, whether from constipation or other causes, can gradually weaken the sphincter muscles or damage the nerves over time. Structural changes also play a role: rectal prolapse (where the rectum drops through the anus), hemorrhoids that prevent the anal muscles from closing fully, and scarring from radiation therapy or inflammatory bowel disease can all interfere with bowel control.
Diarrhea itself makes incontinence worse regardless of the underlying cause. Loose stool is harder to hold than formed stool, so conditions like irritable bowel syndrome, inflammatory bowel disease, and proctitis (inflammation of the rectal lining) frequently contribute to episodes.
How It’s Diagnosed
Diagnosis usually starts with a detailed history of your symptoms and a physical exam. If additional testing is needed, a few specialized tools help pinpoint the problem.
Endoanal ultrasound is one of the most useful tests. A small probe creates a 360-degree image of the sphincter muscles, revealing tears or thinning that wouldn’t be visible any other way. Studies have found it’s the test most likely to change a patient’s treatment plan.
Anorectal manometry measures the pressure your sphincter muscles generate at rest and when you squeeze. It also tests how well your rectum senses fullness by slowly inflating a small balloon. Low resting pressure, weak squeeze pressure, or dulled sensation each suggest different problems and guide treatment in different directions.
Defecography is a real-time imaging study performed while you’re actually having a bowel movement (using a contrast material inserted into the rectum). It’s particularly good at detecting internal rectal prolapse or a rectocele, where the rectum bulges into the vaginal wall, either of which can contribute to leakage.
First-Line Treatments
Treatment nearly always starts with conservative approaches. The American College of Gastroenterology considers an over-the-counter anti-diarrheal medication (loperamide) a first-line option, especially when loose stools are part of the problem. It works by slowing the movement of stool through the intestines, giving you more time to reach a bathroom and producing firmer stools that are easier to hold.
Fiber supplementation is another early step. Soluble fiber absorbs water and adds bulk to stool, making it more formed and predictable. Clinical trials have used around 16 grams of supplemental fiber per day, bringing total daily intake close to the recommended 25 to 30 grams. This alone can reduce leakage episodes for people whose incontinence is driven partly by stool consistency.
Dietary adjustments beyond fiber matter too. Caffeine, alcohol, and foods that trigger loose stools vary from person to person, so keeping a food diary to identify your own patterns is one of the most practical things you can do early on.
Pelvic Floor Therapy and Biofeedback
If medications and dietary changes aren’t enough, biofeedback-assisted pelvic floor therapy is the next step. During sessions, sensors placed near the anal canal display your muscle activity on a screen in real time, letting you see exactly when you’re contracting the right muscles and how strongly. A trained therapist coaches you through exercises to strengthen the sphincter and pelvic floor, and you practice additional exercises at home between sessions.
In one study of 126 patients, about 64% experienced meaningful improvement in both symptoms and measurable muscle function after biofeedback. Success was highest in people who had partial weakness of the external sphincter. Those with tears in both the internal and external sphincter, or tears affecting more than 25% of the external sphincter, were less likely to benefit from biofeedback alone and often needed other interventions.
Sacral Nerve Stimulation
For people who don’t respond to conservative treatment, sacral nerve stimulation is a minimally invasive option. A small device, similar to a pacemaker, is implanted under the skin and delivers gentle electrical pulses to the sacral nerves near the base of the spine. These nerves help control the sphincter muscles and rectal sensation.
The procedure happens in two stages. First, a temporary lead is placed to test whether stimulation improves your symptoms over a trial period. If it does, the permanent device is implanted. In a long-term follow-up study, the five-year success rate for fecal incontinence was 88.2%, and 76% of patients experienced at least a 50% reduction in involuntary leakage episodes per week. About 30% of patients needed a follow-up procedure to address complications like lead migration, but even among that group, the five-year success rate remained high at 89%.
Day-to-Day Skin Care and Practical Tools
Managing symptoms between treatments matters more than many people realize. Stool on the skin causes irritation and breakdown, a condition called incontinence-associated dermatitis, that can become painful quickly.
Barrier products make a significant difference. Waterproof skin protectants that form a thin, long-lasting film over the skin have been shown to reduce dermatitis by about one-third. Barrier creams can lower skin inflammation, improve hydration, and help maintain normal skin pH. Applying one of these products after each cleaning is a simple habit that prevents a lot of discomfort.
For containment, options range from absorbent briefs and underpads to drainable pouches that adhere to the skin around the anus. Single-use underpads with super-absorbent cores keep moisture away from the skin and allow airflow, which is especially important for people who spend long periods sitting or lying down. Choosing the right product depends on how much leakage you experience and your mobility level, but even for mild, occasional episodes, having an absorbent product available reduces anxiety and makes it easier to stay active.