Fecal incontinence is the involuntary loss of stool, ranging from occasional minor leakage to a complete inability to control bowel movements. It affects roughly 8% of adults worldwide, making it far more common than most people realize. The condition often goes unreported because of embarrassment, but effective treatments exist for every severity level.
Three Types of Fecal Incontinence
Not all fecal incontinence looks the same. The three subtypes feel different and point to different underlying problems.
Passive incontinence means stool leaks without you being aware it’s happening. You don’t feel the urge or the leakage itself. This typically signals a nerve problem or dysfunction in the muscles that keep the anal canal closed at rest.
Urge incontinence is the opposite experience. You feel the stool coming and actively try to hold it in, but you can’t get to a bathroom in time. This points to weakness in the sphincter muscles or a reduced ability of the rectum to store stool.
Fecal seepage is the mildest form. You have normal control most of the time, but small amounts of stool leak out, often shortly after a bowel movement. This is the most common pattern and the easiest to manage.
How Your Body Maintains Continence
Bowel control depends on a coordinated system of muscles, nerves, and reflexes. Understanding these helps explain why so many different conditions can disrupt it.
The internal anal sphincter is the primary gatekeeper. This muscle contracts involuntarily and constantly, contributing 55% to 85% of the resting pressure that keeps the anal canal closed. It also has a clever sensing function: it briefly relaxes to let small amounts of rectal contents contact nerve receptors in the upper anal canal. This “sampling reflex” is how your body distinguishes between gas, liquid, and solid stool without you consciously thinking about it.
The external anal sphincter adds another 35% of resting pressure and is the muscle you squeeze voluntarily when you need to hold on. It also contracts reflexively when you cough, sneeze, or strain, preventing accidental leakage during sudden spikes in abdominal pressure.
A third muscle, the puborectalis, wraps like a sling around the upper anal canal and creates an angle between the rectum and the anus. When this muscle contracts, it bends the pathway stool would need to travel, acting as a physical barrier. It tightens automatically when solid stool enters the rectum and when you strain.
When any part of this system is damaged or weakened, continence can break down.
Common Causes
Childbirth Injury
Vaginal delivery is one of the most common causes, particularly when third- or fourth-degree tears extend into the anal sphincter muscles. Up to 50% of women who sustain this type of injury during childbirth will experience some degree of anal incontinence over the long term. Some women develop symptoms immediately, while others don’t notice problems until decades later when age-related muscle weakening compounds the original damage.
Nerve Damage
Conditions that affect the nervous system can disrupt bowel control at multiple levels. In multiple sclerosis, for example, demyelination in the brain can impair voluntary control over defecation, while spinal cord lesions can alter how the rectum stores and moves stool. Spinal cord injuries almost invariably cause some degree of bowel dysfunction because of how central the spinal cord is to coordinating rectal reflexes. Diabetes can also damage the nerves involved in bowel function over time.
Other Causes
Chronic diarrhea from any cause makes incontinence more likely simply because liquid stool is harder to hold than solid stool. Rectal surgery, radiation therapy to the pelvic area, inflammatory bowel disease, and rectal prolapse (where the rectum drops down through the anus) can all contribute. Aging itself plays a role: prevalence is 9.3% in people over 60, compared to 4.9% in younger adults. Women are slightly more affected than men overall (9.1% vs. 7.4%), largely because of the cumulative impact of childbirth injuries.
How It’s Diagnosed
Diagnosis starts with a detailed conversation about your symptoms, including timing, consistency of leakage, and what triggers episodes. A physical exam can reveal obvious muscle weakness or structural problems. Beyond that, several specialized tests help pinpoint the cause.
Anorectal manometry measures the pressures inside the anal canal at rest and during squeezing. It also tests rectal sensation (how much filling you can detect) and whether the internal sphincter relaxes properly when it senses stool. This test provides a functional picture of how well the muscles and nerves are working together.
Endoanal ultrasound creates an image of the sphincter muscles and can identify tears, thinning, or structural defects that aren’t detectable by touch alone. This is especially useful for women with a history of childbirth injury.
Defecography is a type of imaging done while you actually attempt to empty your bowels. It can reveal internal rectal prolapse or bulges in the rectal wall that contribute to incomplete emptying and subsequent leakage.
Conservative Treatments
Most people start with non-surgical approaches, and many find significant relief from these alone.
Dietary fiber supplementation aims to give stool a firmer, more cohesive consistency that’s easier to control. The recommended target is 25 to 30 grams of fiber per day. Among fiber types, psyllium stands out because it forms a gel in the stool, which helps bind loose material. Other soluble fibers like gum arabic are highly fermented in the gut and leave less residual bulk, making them less effective for this specific purpose.
Anti-diarrheal medication can slow down how quickly stool moves through the gut and reduce the frequency of loose bowel movements. It works best when taken before meals, timed to whichever part of the day your episodes are most likely to occur. For people who developed chronic diarrhea after gallbladder removal, bile acid sequestrants can specifically address that trigger.
Pelvic floor rehabilitation, often guided by a specialized physical therapist, uses exercises and biofeedback to strengthen the sphincter muscles and improve coordination. Biofeedback gives you real-time visual or audio signals showing how your pelvic floor muscles are contracting, helping you learn to use them more effectively.
Surgical and Advanced Options
When conservative measures aren’t enough, sacral nerve stimulation is one of the most well-studied options. A small device is implanted near the tailbone and delivers gentle electrical pulses to the nerves that control the rectum and sphincter muscles. At three years of follow-up, 86% of patients achieved at least a 50% reduction in incontinence episodes per week. The average number of episodes dropped from 9.4 per week to 1.7. Forty percent of patients achieved complete continence.
Injectable bulking agents offer a less invasive approach. These materials are injected into the tissue around the anal canal to physically increase the bulk of the sphincter area, compensating for weak internal sphincter tone. The procedure is done in an outpatient setting and doesn’t require general anesthesia.
Sphincter repair surgery may be appropriate when imaging shows a clear, localized tear in the sphincter muscle, particularly after childbirth injury. Results tend to be best in the short term, with some decline in effectiveness over the years.
Protecting Your Skin
Frequent contact with stool irritates and breaks down skin quickly, leading to painful rashes known as incontinence-associated dermatitis. Cleaning the area gently after each episode is essential. Use mild, soap-free cleansers rather than regular soap, and pat dry rather than rubbing. Barrier creams containing zinc oxide, lanolin, or petrolatum create a protective layer between the skin and moisture. These need to be reapplied after each cleaning. Skin sealant sprays or wipes can also create a clear protective film, which some people find easier to manage throughout the day. Avoid any products containing alcohol, which will further irritate already vulnerable skin.