Mucous Fistula: What It Is, Why It's Done, Care and Recovery
Updated: 6 days ago
Written and medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026 · How we review
Quick Answer: What is a mucous fistula?
A mucous fistula is a surgically created second stoma that brings a disconnected end of the intestine to the belly skin so intestinal mucus can drain out instead of building up. It is made during an end ileostomy or colostomy, most often for inflammatory bowel disease, colon cancer or diverticulitis, and is usually temporary until the bowel is reconnected. [1]
What the research says
About 1 in 3 people with an intestinal stoma develop a stoma complication. A meta-analysis of 16 studies covering 10,520 patients found a pooled stoma complication rate of 35% (range 9%–63%). Rates were higher in people with obesity (66%) and after laparoscopic or emergency stoma surgery (68%). (Dellafiore et al., Current Medical Research and Opinion, 2022) [2]
Feeding stool output back into the mucous fistula shortened IV nutrition in newborns. Across 16 observational studies (623 neonates), babies who received mucous fistula refeeding needed about 37 fewer days of parenteral (IV) nutrition and had less cholestasis, faster progress to full feeds and shorter hospital stays. The certainty of this evidence was rated low. (Solís-García et al., Archives of Disease in Childhood – Fetal and Neonatal Edition, 2023) [3]
Serious refeeding complications in infants were uncommon. A review of 17 studies (631 infants) found IV nutrition lasted 60.3 days with refeeding versus 95 days without. Reported complications included sepsis in 3.5%, intestinal perforation in 0.83% and bleeding in 0.62% of infants. (Musleh et al., Nutrients, 2025) [4]
Key takeaways
A mucous fistula is a second, smaller stoma that drains mucus from a disconnected section of bowel.
It is created at the same time as an end ileostomy or end colostomy, never as a stand-alone operation.
It is common in surgery for ulcerative colitis, Crohn's disease, diverticulitis and colon cancer, and in some newborns with bowel birth defects.
Mucus output is heaviest early on and decreases over time — many people move from a small pouch to gauze or a stoma cap.
In otherwise healthy people it is usually temporary; the bowel can be reconnected once it has healed.
What is a mucous fistula?
A mucous fistula is an opening that attaches a disconnected part of your intestine to a small, surgically created hole in the skin of your belly, called a stoma. [1] Its job is to let mucus — the natural secretions your intestines make — leave the body through the stoma rather than through the anus.
When surgeons divide the bowel, the upstream end carries stool and the downstream end is cut off from the food stream. That downstream end still produces mucus. The mucous fistula gives this mucus a safe way out.
When you have two stomas, the disconnected one is also called the distal mucous fistula. [1]
Why does the intestine need a way to drain mucus?
The intestine needs a mucus outlet because its lining keeps producing mucus even when no food passes through it. Your intestines make mucus to protect themselves from irritants such as undigested food particles. [1]
Here is how the bowel normally works:
Small intestine: healthy bacteria break down food so your body can absorb nutrients and fluids.
Large intestine (colon): bacteria keep breaking food down, gas may form, and water is absorbed to turn liquid waste into solid stool.
Without a mucous fistula, secretions from a disconnected bowel segment can build up and cause abdominal pain and other problems. [1]
When do you need a mucous fistula?
You may need a mucous fistula when a surgeon has to divide your bowel and bring the stool-carrying end out as an ileostomy or colostomy. People with inflammatory bowel diseases are the most likely to need one, and it is made during other surgeries that treat the disease. [1] Surgeons also use it to stop the closed-off bowel end from "blowing out" and leaking inside the belly. [1]
Usual pairing by condition [1]
Condition | Usual stoma combination |
Ileostomy + mucous fistula | |
Ileostomy + mucous fistula | |
Colostomy + mucous fistula | |
Sigmoid colon cancer | Colostomy + mucous fistula |
Other conditions that may require a mucous fistula include: [1]
Colorectal (colon) cancer
Diverticulosis
Intestinal injury or trauma
Large bowel obstruction
Small bowel obstruction
Why do babies and children need a mucous fistula?
Babies and children need a mucous fistula mainly to manage two birth defects of the bowel: [1]
Imperforate anus: some newborns are born without an anal opening. They need a colostomy and mucous fistula as a temporary fix until they are strong enough for corrective surgery.
Intestinal atresia: some babies are born with blocked or interrupted sections of intestine. If these cannot be repaired in one operation, a mucous fistula may be needed.
Which surgeries include a mucous fistula?
A mucous fistula is always made during another bowel operation — usually an end colostomy or an end ileostomy. [1]
End colostomy | End ileostomy | |
Bowel brought to the skin | One end of the large intestine | Last part of the small intestine (ileum) |
Common context | Diverticulitis, sigmoid colon cancer | Often after a colectomy for IBD |
What exits the main stoma | Stool, into an ostomy pouch | Stool, into an ostomy pouch |
Second stoma | Mucous fistula (mucus only) | Mucous fistula (mucus only) |
With either operation you end up with two stomas: a larger one for stool and a smaller one for mucus. [1]
Learn more in our colostomy guide.
Who performs a mucous fistula procedure?
A colorectal surgeon performs mucous fistula surgery, because it is an operation on the digestive tract. [1] You may also see a gastroenterologist — a doctor who treats digestive diseases without surgery.
How should you prepare for mucous fistula surgery?
You prepare for mucous fistula surgery by following your surgeon's specific instructions, which usually include: [1]
Fasting — no food or drink for a set number of hours before surgery.
Reviewing medicines — stopping certain prescription and over-the-counter drugs.
Quitting smoking and vaping — ideally at least a few weeks before, because smoking raises the risk of surgical problems and slows healing.
Bowel prep — using a prescription bowel preparation to empty and clean the bowel.
What happens during mucous fistula surgery?
During mucous fistula surgery, the surgeon divides the intestine into two ends and brings each one out through its own opening in the belly. The operation takes place in a hospital under general anesthesia, at the same time as the colostomy or ileostomy. [1]
The surgeon: [1]
Makes an incision in the abdomen, disconnects the intestine and divides it into an upstream (proximal) and a downstream (distal) segment.
Brings each end of the divided intestine to its own surgically created opening in the abdomen.
Stitches each end to the skin, creating two stomas.
Closes the main incision.
Attaches ostomy bags to the stomas.
The upstream segment becomes the ileostomy or colostomy. The downstream segment becomes the mucous fistula.
What does a mucous fistula look like, and how do you care for it?
A healthy stoma looks pink and moist, like the inside of your cheek, because you are seeing the lining of your intestine. [1] Stomas have no nerves, so they are not painful or sensitive to touch.
Care changes as mucus output falls: [1]
Stage | Mucus output | Typical covering |
Early after surgery | Often heavy | Small ostomy pouch (smaller than the main ileostomy or colostomy pouch) |
As healing continues | Decreasing | Smaller pouch or dressing |
Later | Light | A piece of gauze, or a stoma cap |
Is a mucous fistula permanent?
A mucous fistula is usually not permanent in otherwise healthy people. [1] Doctors often recommend it, together with the end ileostomy or colostomy, as a temporary step that gives inflamed bowel time to rest and heal.
Healing can take weeks, months or years. When you are ready, the surgeon can reconnect the intestine so you can pass stool through the anus again. [1]
What are the benefits and risks of a mucous fistula?
The main benefit of a mucous fistula is that it gives your body a way to get rid of intestinal mucus and secretions when you have an ileostomy or colostomy, preventing painful build-up. [1]
Possible complications include: [1]
Complication | What it means |
Mucus drainage | Ongoing discharge from the mucous fistula |
Diversion proctitis | Inflammation of the unused rectum, which can cause bleeding and passing of blood clots |
Tissue bulging through a weak spot near the stoma | |
Infection | Infection at the surgical or stoma site |
Stoma separation | The stoma pulling away from the skin |
Retraction, prolapse, stricture or trauma | Stoma sinking below the skin, slipping out of place, narrowing or getting injured |
Skin irritation or sores | Friction from the pouch |
Necrosis | Death of tissue at the stoma site |
Across intestinal stomas in general, about 35% of patients develop at least one stoma complication. [2]
What is recovery like after a mucous fistula procedure?
Recovery after a mucous fistula procedure usually starts with up to one week in hospital, where the care team teaches you how to look after your stomas. [1]
What to expect: [1]
Bruising and light bleeding around the stomas.
Stomas that look large, moist and dark at first, then become smaller and flatter over time.
Heavy mucus from the mucous fistula early on, which lessens with time.
Activity limits, such as avoiding heavy lifting until you heal.
Anti-inflammatory suppositories, which sometimes help reduce blood and mucus discharge from the mucous fistula.
When should you call your doctor about a mucous fistula?
You should call your doctor about a mucous fistula if you notice any of these signs: [1]
Blood in your stool
Difficulty peeing or passing stool
Excessive bleeding
Nausea and vomiting
Signs of infection, such as fever or chills
Are there alternatives to a mucous fistula?
The main alternatives to a mucous fistula are a loop ostomy or Hartmann's procedure, depending on your condition and the surgeon's plan. [1]
Option | How it works | Number of stomas |
End ostomy + mucous fistula | Stool exits the main stoma; mucus exits a separate, smaller stoma | Two |
Loop ileostomy or loop colostomy | A loop of bowel is brought to the skin; one side passes stool, the other passes mucus through the same opening. Usually used when the bowel can be reconnected at the first operation | One |
Colostomy + Hartmann's procedure | The sigmoid colon is removed, an end colostomy is made, and the rectum is closed off as a non-functioning pouch | One |
For people who already have a colostomy, our guide to colostomy irrigation explains another way some patients manage stool output.
Conclusion
A mucous fistula is a small but important part of many bowel operations. It gives a disconnected section of intestine a safe exit for mucus, protects against leakage inside the belly and, for most people, is temporary until the bowel heals and can be reconnected. Knowing what the stoma should look like, how care changes as mucus decreases and which warning signs need a call to your doctor can make the weeks after surgery far less daunting. Your surgical and stoma care team is your best partner in learning to live well with two stomas.
Want to understand the condition behind your surgery? Explore our plain-language guides to inflammatory bowel disease, colectomy and colostomy — and bookmark Rinnit.com for clear, medically reviewed health information you can trust.
FAQ
What is a mucous fistula?
A mucous fistula is a second stoma that connects a disconnected section of intestine to the belly skin so mucus can drain out. It is created during an end ileostomy or end colostomy.
Why would a surgeon create a mucous fistula?
A surgeon creates a mucous fistula so the closed-off section of bowel can release mucus instead of building up or "blowing out" and leaking inside the belly. It is most common in surgery for ulcerative colitis, Crohn's disease, diverticulitis and sigmoid colon cancer.
Is a mucous fistula the same as a colostomy?
A mucous fistula is not the same as a colostomy. A colostomy passes stool into a pouch, while a mucous fistula only drains mucus from a disconnected bowel segment, usually through a smaller stoma.
How much mucus comes out of a mucous fistula?
A mucous fistula can produce a lot of mucus early after surgery, often enough to need a small pouch. The amount decreases over time, and many people later cover the stoma with gauze or a stoma cap.
Does a mucous fistula hurt?
A mucous fistula stoma does not hurt to touch because stomas have no nerves. Bruising and light bleeding around the site are expected in the early recovery period.
Can a mucous fistula be reversed?
A mucous fistula can usually be reversed in otherwise healthy people. Once the bowel has healed — which can take weeks, months or years — the surgeon reconnects the intestine so stool passes through the anus again.
What are the alternatives to a mucous fistula?
The main alternatives to a mucous fistula are a loop ileostomy or loop colostomy, which drains stool and mucus through a single stoma, and Hartmann's procedure, which closes off the rectum as a non-functioning pouch.
When should I call a doctor about my mucous fistula?
You should call a doctor about a mucous fistula if you have blood in your stool, excessive bleeding, nausea and vomiting, trouble peeing or passing stool, or signs of infection such as fever or chills.
Do you need a pouch on a mucous fistula?
Many people only need a small gauze pad or dressing, because a mucous fistula usually makes small amounts of mucus. Some people need a small pouch if there is more output, and your ostomy nurse will advise you.
Is it normal to pass mucus from the rectum with a mucous fistula?
Yes, it can be normal if the disconnected bowel still links to your rectum, because that bowel keeps making mucus. Tell your care team if the mucus is bloody, foul-smelling or painful to pass.
Related Reading
Ileostomy: Types, Surgery, Recovery, Stoma Care and Reversal explains how an ileostomy is made and how to care for it.
Colostomy: Procedure, Types, and Recovery covers the types of colostomy, the surgery and recovery.
Hartmann's Procedure: Why It's Done, Recovery and Reversal describes this alternative bowel surgery and how it can be reversed.
Anorectal Malformation (Imperforate Anus): Causes, Types, Treatment & Outlook explains this birth defect of the bowel and how it is repaired.
References
Cleveland Clinic. Mucous Fistula: Definition, Function & Care. Cleveland Clinic. Last updated April 22, 2022. https://my.clevelandclinic.org/health/treatments/22844-mucous-fistula
Dellafiore F, Caruso R, Bonavina L, et al. Risk factors and pooled incidence of intestinal stoma complications: systematic review and Meta-analysis. Curr Med Res Opin. 2022;38(7):1103-1113. PMID 35608158. https://doi.org/10.1080/03007995.2022.2081455
Solís-García G, Jasani B. Mucous fistula refeeding in neonates: a systematic review and meta-analysis. Arch Dis Child Fetal Neonatal Ed. 2023;108(5):523-529. PMID 36858828. https://doi.org/10.1136/archdischild-2022-324995
Musleh L, Cozzi I, Di Napoli A, et al. Mucous Fistula Refeeding in Newborns: Why, When, How, and Where? Insights from a Systematic Review. Nutrients. 2025;17(15):2490. PMID 40806076. https://doi.org/10.3390/nu17152490
Further reading (external):
American Society of Colon and Rectal Surgeons. Ostomy Expanded Information. ASCRS. Accessed October 31, 2026. https://fascrs.org/Web/Web/Patients/Diseases-and-Conditions/A-Z/Ostomy-Expanded-Information.aspx
Crohn's & Colitis Foundation. Ostomy Tips and Tricks: Living with an Ostomy and IBD. Crohn's & Colitis Foundation. Accessed October 31, 2026. https://www.crohnscolitisfoundation.org/patientsandcaregivers/treatment/surgery/ostomy
Medical disclaimer
This article is for educational purposes only and does not replace professional medical advice, diagnosis or treatment. Always speak with your surgeon or healthcare provider about your own condition and care plan. If you have heavy bleeding, fever or other urgent symptoms, seek medical care right away.
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