Causes

Fecal incontinence can have several causes:

• damage to the anal sphincter muscles
• damage to the nerves of the anal sphincter muscles or the rectum
  
• poor anal sphincter tone
  
• loss of storage capacity in the rectum
  
• diarrhea
  
• pelvic floor dysfunction
  

Muscle Damage
Fecal incontinence is most often caused by injury to one or both of the ring-like muscles at the end of the rectum called the anal internal and/or external sphincters. The sphincters keep stool inside. When damaged, the muscles aren't strong enough to do their job, and stool can leak out. In women, the damage often happens when giving birth. The risk of injury is greatest if the doctor uses forceps to help deliver the baby or does an episiotomy, which is a cut in the vaginal area to prevent it from tearing during birth. Hemorrhoid surgery can damage the sphincters as well.

Nerve Damage
Fecal incontinence can also be caused by damage to the nerves that control the anal sphincters or to the nerves that sense stool in the rectum. If the nerves that control the sphincters are injured, the muscle doesn't work properly and incontinence can occur. If the sensory nerves are damaged, they don't sense that stool is in the rectum. You then won't feel the need to use the bathroom until stool has leaked out. Nerve damage can be caused by childbirth, a long-term habit of straining to pass stool, stroke, and diseases that affect the nerves, such as diabetes and multiple sclerosis.

Loss of Sphincter tone
The anal sphincter stays contracted to maintain the integrity of the rectum and prevent soiling and relaxes with a bowel movement. Over time and with age, the sphincter tone can diminish, causing loss of control.

Loss of Storage Capacity
Normally, the rectum stretches to hold stool until you can get to a bathroom. But rectal surgery, radiation treatment, and inflammatory bowel disease can cause scarring that makes the walls of the rectum stiff and less elastic. The rectum then can't stretch as much and can't hold stool, resulting in fecal incontinence. Inflammatory bowel disease also can make rectal walls very irritated and thereby unable to contain stool.

Diarrhea
Diarrhea, or loose stool, is more difficult to control than solid stool that is formed. Even people who don't have fecal incontinence can have an accident when they have diarrhea. 

Pelvic Floor Dysfunction
Abnormalities of the pelvic floor can lead to fecal incontinence. Examples of some abnormalities are decreased perception of rectal sensation, decreased anal canal pressures, decreased squeeze pressure of the anal canal, impaired anal sensation, a dropping down of the rectum (rectal prolapse), protrusion of the rectum through the vagina (rectocele), and/or generalized weakness and sagging of the pelvic floor. Often the cause of pelvic floor dysfunction is childbirth, and incontinence doesn't show up until the mid-40s or later.

Diagnosis​

The doctor will ask health-related questions and do a physical exam and possibly other medical tests.

• Anal manometry checks the tightness of the anal sphincter and its ability to respond to signals, as well as the sensitivity and function of the rectum. 
• Anorectal ultrasonography evaluates the structure of the anal sphincters. 
  
• Proctography, also known as defecography, shows how much stool the rectum can hold, how well the rectum holds it, and how well the rectum can evacuate the stool. 
  
• Proctosigmoidoscopy allows doctors to look inside the rectum for signs of disease or other problems that could cause fecal incontinence, such as inflammation, tumors, or scar tissue. 
  
• Anal electromyography tests for nerve damage, which is often associated with obstetric injury.
  

Treatment

Treatment depends on the cause and severity of fecal incontinence; it may include dietary changes, medication, bowel training, or surgery. More than one treatment may be necessary for successful control since continence is a complicated chain of events.

Dietary Changes
Food affects the consistency of stool and how quickly it passes through the digestive system. One way to help control fecal incontinence in some persons is to eat foods that add bulk to stool, making it less watery and easier to control. Also, avoid foods that contribute to the problem. They include foods and drinks containing caffeine, like coffee, tea, and chocolate, which relax the internal anal sphincter muscle. Another approach is to eat foods low in fiber to decrease the work of the anal sphincters. Fruit can act as a natural laxative and should be eaten sparingly.
You can adjust what and how you eat to help manage fecal incontinence.

• Keep a food diary. List what you eat, how much you eat, and when you have an incontinent episode. After a few days, you may begin to see a pattern between certain foods and incontinence. After you identify foods that seem to cause problems, cut back on them and see whether incontinence improves. Foods that typically cause diarrhea, and so should probably be avoided, include
• caffeine 
  
• cured or smoked meat like sausage, ham, or turkey 
  
• spicy foods 
  
• alcohol 
  
• dairy products like milk, cheese, and ice cream 
  
• fruits like apples, peaches, or pears 
  
• fatty and greasy foods 
  
• sweeteners, like sorbitol, xylitol, mannitol, and fructose, which are found in diet drinks, sugarless gum and candy, chocolate, and fruit juices.
  
• Eat smaller meals more frequently. In some people, large meals cause bowel contractions that lead to diarrhea. You can still eat the same amount of food in a day, but space it out by eating several small meals.
  
• Eat and drink at different times. Liquid helps move food through the digestive system. So if you want to slow things down, drink something half an hour before or after meals, but not with the meals.
  
• Eat more fiber. Fiber makes stool soft, formed, and easier to control. Fiber is found in fruits, vegetables, and grains, like those listed below.  You'll need to eat 20 to 30 grams of fiber a day, but add it to your diet slowly, so your body can adjust. Too much fiber all at once can cause bloating, gas, or even diarrhea.  Also, too much insoluble, or undigestible, fiber can contribute to diarrhea. So if you find that eating more fiber makes your diarrhea worse, try cutting back to two servings each of fruits and vegetables and removing skins and seeds from your food.
  
• Eat foods that make stool bulkier. Foods that contain soluble, or digestible, fiber slow the emptying of the bowels. Examples are bananas, rice, tapioca, bread, potatoes, applesauce, cheese, smooth peanut butter, yogurt, pasta, and oatmeal. 
  
• Get plenty to drink. You need to drink eight 8-ounce glasses of liquid a day to help prevent dehydration and to keep stool soft and formed. Water is a good choice, but avoid drinks with caffeine, alcohol, milk, or carbonation if you find that they trigger diarrhea.
  
• Vitamins. Over time, diarrhea can rob you of vitamins and minerals. Ask your doctor if you need a vitamin supplement.
  

What to Do About Anal Discomfort

The skin around the anus is delicate and sensitive. Constipation and diarrhea or contact between skin and stool can cause pain or itching. Here's what you can do to relieve discomfort:

• Wash the area with water, but not soap, after a bowel movement. Soap can dry out the skin, making discomfort worse. If possible, wash in the shower with lukewarm water or use a sitz bath. Or try a no-rinse skin cleanser. Try not to use toilet paper to clean up – rubbing with dry toilet paper will only irritate the skin more. Premoistened, alcohol-free towelettes are a better choice. 
• Let the area air dry after washing. If you don't have time, gently pat yourself dry with a lint-free cloth.
  
• Use a moisture barrier cream, which is a protective cream to help prevent skin irritation from direct contact with stool. However, talk to your health care professional before you try anal ointments and creams because some have ingredients that can be irritating. Also, you should clean the area well first to avoid trapping bacteria that could cause further problems. Your health care professional can recommend an appropriate cream or ointment.
  
• Try using nonmedicated talcum powder or corn starch to relieve anal discomfort.
  
• Wear cotton underwear and loose clothes that "breathe." Tight clothes that block air can worsen anal problems. Change soiled underwear as soon as possible.
  
• If you use pads or diapers, make sure they have an absorbent wicking layer on top. Products with a wicking layer protect the skin by pulling stool and moisture away from the skin and into the pad.
  

Emotional Considerations

​Because fecal incontinence can cause distress in the form of embarrassment, fear, and loneliness, taking steps to deal with it is important. Treatment can help improve your life and help you feel better about yourself. If you haven't been to a gasteroenterologist yet, make an appointment.

Everyday practical Tips

• Take a backpack or tote bag containing cleanup supplies and a change of clothing with you everywhere.
  
• Locate public restrooms before you need them so you know where to go.
  
• Use the toilet before heading out.
  
• If you think an episode is likely, wear disposable undergarments or sanitary pads.
  
• If episodes are frequent, use oral fecal deodorants to add to your comfort level.
  

Fecal incontinence is the inability to control your bowels. Symptoms of fecal incontinence can be the inability to make it to a toilet after feeling the urge to have a bowel movement, or the unexpected leakage of stool from the rectum.

More than 6.5 million Americans have fecal incontinence. It affects people of all ages--children as well as adults. Fecal incontinence is more common in women than in men and more common in older adults than in younger ones.
It is not, however, a normal part of aging.

Loss of bowel control can be devastating. People who have fecal incontinence may feel ashamed, embarrassed, or humiliated. Some don't want to leave the house out of fear they might have an accident in public. Most try to hide the problem as long as possible, so they withdraw from friends and family. The social isolation is unfortunate, but there are treatment options that can help to reduce social anxiety, improve bowel control, and make incontinence easier to manage.

Incontinence