An ileostomy is a surgically created opening in the abdomen that allows stool to exit the body through the small intestine instead of passing through the colon and out the rectum. During the procedure, a surgeon brings part of the ileum (the lowest section of the small intestine) through the abdominal wall to create a small, raised opening called a stoma. A pouch worn on the outside of the body attaches to the stoma and collects waste.
People need an ileostomy when disease, injury, or a birth defect makes the large intestine unable to function safely. Some ileostomies are temporary, designed to give a healing section of bowel time to recover. Others are permanent.
Why an Ileostomy Is Needed
The most common reason for an ileostomy is inflammatory bowel disease, specifically ulcerative colitis or Crohn’s disease. When medications can no longer control inflammation, bleeding, or damage in the colon, removing part or all of it may be the only remaining option. An ileostomy gives stool a new exit route once the colon is bypassed or removed.
Other conditions that can lead to an ileostomy include colon or rectal cancer, familial polyposis (a genetic condition that causes hundreds of precancerous growths in the colon), birth defects affecting the intestines, and traumatic injuries to the bowel. In rectal cancer surgery specifically, surgeons often create a temporary, or “diverting,” ileostomy to protect a fragile internal connection while it heals.
End Ileostomy vs. Loop Ileostomy
There are two main types. An end ileostomy brings one cut end of the ileum out through the abdominal wall to form the stoma. This is typically done when the colon has been removed entirely, making the ileostomy permanent.
A loop ileostomy pulls a fold of the ileum up through the abdominal wall without fully cutting the intestine in two. It’s most often used as a temporary measure. Because the intestine hasn’t been completely divided, reconnecting it later is a simpler procedure. Loop ileostomies are the standard choice when surgeons plan to reverse the stoma once the downstream bowel has healed.
What Reversal Looks Like
When an ileostomy is intended to be temporary, reversal surgery is generally performed three to six months after the initial operation. That timeline can stretch longer if you’re receiving chemotherapy or if healing is slower than expected. Before reversal, imaging tests are done to confirm the internal connection in your bowel has healed properly and there’s no leak.
Not every temporary ileostomy gets reversed, though. Studies consistently find that 15 to 30 percent of diverting ileostomies become permanent, often because of complications, disease progression, or other health factors that make a second surgery too risky. For patients who do end up with a lifelong stoma, annual healthcare costs related to stoma management can exceed $10,000 to $15,000.
How the Pouching System Works
Because stool from the small intestine is liquid to semi-formed and flows continuously (there’s no sphincter muscle to control it), you wear an external pouching system at all times. The system has two basic parts: a skin barrier that sticks to the skin around the stoma, and a pouch that collects waste.
In a one-piece system, the skin barrier and pouch are fused together as a single unit. You remove and replace the whole thing when you change it. In a two-piece system, the skin barrier stays on your skin and has a flange, essentially a ring, that the pouch snaps onto. This lets you swap out the pouch without peeling off the adhesive barrier each time, which can be gentler on your skin.
Most people with an ileostomy use a drainable pouch, which has an opening at the bottom you can unclip to empty into a toilet several times a day. Closed-end pouches, which are discarded when full, are an option for people who prefer a lower-profile design and use a two-piece system so only the pouch itself is thrown away. Many pouches also have a built-in filter that lets gas pass through without releasing odor.
The skin barrier itself comes in flat or convex shapes. Convex barriers curve outward to help a stoma that sits flush with or slightly below the skin surface protrude enough for a good seal. Flat barriers work when the surrounding skin is smooth and the stoma already sticks out clearly.
Eating and Staying Hydrated
Digestion changes significantly with an ileostomy because the colon, which normally absorbs water and electrolytes, is no longer in the picture. Stool output is more liquid, and you lose more fluid and salt than you did before surgery. The general recommendation is to drink 500 to 750 milliliters more fluid per day than the average person, focusing on water, broth, vegetable juice, or electrolyte drinks.
If your stoma output is high (roughly 1 to 1.5 liters per day), limiting total fluid intake to under 1.5 liters and adding extra salt to your meals can help your body retain what it needs. For very high output above 1.5 to 2 liters per day, plain water, tea, coffee, juice, and alcohol actually worsen the problem because they’re hypotonic, meaning they pull more fluid into the gut. In those cases, glucose-electrolyte solutions, similar to oral rehydration drinks, work far better than water alone.
A few practical timing strategies make a difference. Drinking between meals rather than during them, and limiting fluids 30 minutes before and after eating, helps slow output. Eating larger portions at breakfast and lunch with a lighter dinner and less fluid in the evening can reduce overnight stoma output and improve sleep.
For the first six to eight weeks after surgery, high-fiber foods are the main concern. Oats, raw fruits and vegetables, corn, nuts, legumes, and anything with tough skins or casings can clump together and block the stoma. Cooked or canned fruits are safer alternatives during this period. Even after that initial phase, foods like popcorn, coconut, mushrooms, celery, dried fruit, and meats with casings remain common culprits for blockages and should be chewed thoroughly and eaten in small amounts.
Common Complications
Skin irritation around the stoma is one of the earliest and most frequent issues. Because ileostomy output contains digestive enzymes that are still active (the colon normally neutralizes them), any stool that leaks under the skin barrier can quickly cause redness, burning, and breakdown of the surrounding skin. Getting a properly fitted barrier is the single most important step in preventing this.
Dehydration is a persistent risk, especially in the first weeks and during hot weather or illness. Signs include dark urine, dizziness, dry mouth, and noticeably reduced stoma output. Because the colon is bypassed, your body has far less capacity to compensate for fluid losses.
Parastomal hernia, where tissue pushes through the abdominal wall around the stoma, is the most common long-term complication. Reported rates range from 30 to 50 percent depending on how long patients are followed and whether imaging is used to detect smaller hernias. One study found that when both physical examination and CT scans were used, the rate climbed from 52 percent to 78 percent at 15 months. Parastomal hernias can cause pain, difficulty with pouch fit, and in some cases bowel obstruction. They also tend to worsen skin problems and reduce quality of life.
Recovery After Surgery
The typical hospital stay after ileostomy surgery is around four days for patients without complications, though it can range widely depending on the reason for surgery and your overall health. During that time, a wound and ostomy care nurse will teach you how to empty and change your pouch, care for the skin around your stoma, and recognize signs of problems.
The stoma itself has no nerve endings, so touching or cleaning it doesn’t hurt. It’s normal for it to appear bright red and slightly swollen in the first weeks. It gradually shrinks over the following two to three months, which means you may need to resize your skin barrier during that period. Most people return to work, exercise, and daily routines within several weeks, though heavy lifting is typically restricted for six to eight weeks to reduce the risk of hernia.