What is pouchitis?

Pouchitis is the inflammation of the ileal pouch, a reservoir created after removing the large intestine (colon and rectum) in a restorative proctocolectomy surgery, caused by colorectal diseases such as ulcerative colitis and Crohn’s disease. This ileal pouch allows the control of bowel movements and going to the toilet, without having to wear a bag outside of the body. An ileal pouch is a successful form of treatment in most cases; however, there are possibilities for complications such as Pouchitis. ^1,2  

What are the symptoms of pouchitis?

Pouchitis causes similar symptoms to colitis, which is the inflammation of the colon or rectum, but in Pouchitis, it occurs in individuals with an ileal pouch.¹

Symptoms include:

• More urgent and frequent bowel movements
• Lower abdominal pain and cramping
• Tenesmus (the urge to pass stool, even when there is no need to do so)
• Fevers or chills
• Traces of blood in your stool
• Bowel incontinence (leaking)
• Having to go to the bathroom during the night

Often, individuals experience acute pouchitis, a short-term, temporary inflammation of the ileal pouch. Less commonly, individuals may experience recurring or chronic pouchitis ^1,2

How is pouchitis diagnosed?

Diagnosing pouchitis begins with reviewing medical history while evaluating symptoms. Providers examine the inside of the ileal pouch with an endoscope, a thin, flexible tube with a small camera on the end.This allows them to look directly for signs of inflammation or other changes. During the procedure, they may also take a small tissue sample (biopsy) to check for possible causes.¹

Imaging tests may also be performed to provide a clearer picture of the pouch and its surrounding structures, especially if another condition might be contributing to the symptoms. These can include:¹

• MRI
• CT scan
• Contrast pouchography (pouchogram): a type of X-ray where contrast fluid is injected into the pouch to highlight its shape and outline

What causes pouchitis?

Pouchitis is linked to changes in the balance of bacteria within the ileal pouch.¹ When a section of the small intestine is reshaped to functionlike a large intestine, it comes into contact with new types of bacteria.  This can confuse your immune system, causing it to react as if there’s an infection, leading to inflammation.¹

Often, inflammation allows harmful bacteria called pathogenic bacteria to grow.  Normally, the “good” bacteria in your gut keep them under control, but after a restorative proctocolectomy, the mix of bacteria changes, and the harmful types may have more opportunity to take over. ¹

It’s common to develop pouchitis soon after surgery, and this is known as early-onset pouchitis. It’s usually a temporary side effect that responds well to antibiotics.¹ For many people, symptoms go away, though pouchitis can return, especially if the bacterial balance never fully recovers.¹

When pouchitis recurs, antibiotics can often treat it successfully each time. Problems can arise if it happens several times a year, which, in these cases, some people begin to rely on antibiotics regularly, a condition called chronic antibiotic-dependent pouchitis (CADP). For others, antibiotics gradually stop working as well, after their constant use, leading to chronic antibiotic-resistant pouchitis (CARP), which requires different treatment methods.¹

What contributes to chronic antibiotic-resistant pouchitis (CARP)?

Antibiotic-resistant pouchitis is a chronic condition that can have several causes. Some of the main contributing factors include:

• Inflammatory bowel disease (IBD): Pouchitis is much more common in people who have had pouch surgery for ulcerative colitis or Crohn’s disease.⁷ These conditions cause the same inflammatory response that causes Pouchitis and may continue to affect the pouch⁷
• Antibiotic-resistant bacteria: Certain infections, such as C. difficile, don’t always respond to antibiotics, and over time, frequent antibiotic use can also cause normally harmless bacteria in the pouch to develop resistance, leading to an imbalance and causing inflammation¹
• Weakened immune system (immunosuppression): Some medical conditions and medications lower the body’s ability to fight infection, which can make pouchitis more likely¹
• Chronic NSAID use: Regular use of common pain relievers like aspirin or ibuprofen can damage the lining of the gut and ileal pouch, increasing the risk of inflammation¹
• Other infections: Sometimes pouchitis is triggered by viruses (such as cytomegalovirus) or fungi (such as Candida), which can cause inflammation in the pouch¹

How is pouchitis treated and managed?

What is the treatment for chronic antibiotic-dependent pouchitis (CADP)

Acute pouchitis is treated with antibiotics, and if it recurs, it will continue to be treated in the same way as long as there aren’t more than 3 recurrences in a year, which is then considered CADP. This is then treated with long-term maintenance therapies, including lower-dose antibiotics long-term and probiotics, which can help maintain healthy gut bacteria.¹

What is the treatment for chronic antibiotic-resistant pouchitis (CARP)?

When pouchitis doesn’t improve or stops responding to antibiotics like metronidazole and ciprofloxacin, the condition is referred to as Chronic Antibiotic-Resistant Pouchitis (CARP). or¹

Tests are performed to determine if there are underlying issues, such as a hidden infection or an autoimmune condition.^1,4 If no specific cause is found, chronic pouchitis is usually managed similarly  to inflammatory bowel disease (IBD), using treatments that control the immune system and reduce inflammation.^1,3,4

Possible treatments include:

• Mesalamine (5-ASA)
• Corticosteroids
• Thiopurines
• Biologic therapies

Mesalamine (5-ASA)

Mesalamine, also known as 5-aminosalicylic acid (5-ASA), is an anti-inflammatory medication used to treat pouchitis. Itworks by calming inflammation inside the pouch by blocking the chemicals that cause the irritation, while also helping to strengthen and repair the pouch lining.^1,3

Doctors often prescribe mesalamine as a rectal enema or suppository, allowing the medicine to act directly on the pouch lining, though in some cases, it may also be given in pill form.^1,3

Mesalamine can help ease pouchitis symptoms such as:

• More frequent bowel movements
• Urgency (feeling you have to go right away)
• Abdominal cramps or discomfort

How is mesalamine used?

• Rectal enemas or suppositories that deliver the medicine directly to the pouch
• Oral tablets, which act more broadly in the bowel

Possible side effects of mesalamine

While mesalamine works to treat mild inflammation, it is not effective for everyone and can cause side effects in some individuals.⁵

• Allergic reactions such as skin rashes, hives, and swelling
• Dry cough and shortness of breath
• Chest pain and irregular heartbeat
• Swollen ankles
• Kidney stones
• If any of these occur, report to a health professional as soon as possible

Mesalamine remains a safe option to treat mild pouchitis.

Corticosteroids

Corticosteroids, like budesonide, are strong anti-inflammatory medications used to treat CARP by reducing inflammation and improving symptoms. This approach has been shown to be more effective than antibiotics such as metronidazole, with fewer side effects.⁴

They can be taken by mouth or used directly in the pouch through budesonide enemas or ileal-release budesonide capsules.

Due to potential side effects, including weight gain, high blood sugar, and bone weakening, corticosteroids are recommended only for short-term use.

Thiopurines (azathioprine, 6-mercaptopurine)

Thiopurines are immunomodulators, which means they help control the immune system and reduce long-term inflammation. They are sometimes used for chronic pouchitis that behaves more like Crohn’s disease. Scientific evidence for their use in pouchitis is limited, but they may help when other treatments fail.⁶

Regular monitoring is required, as these medications can cause side effects bone marrow suppression, liver toxicity, and increased risk of infections.⁶

Biologic therapies

Biologic medications target specific immune pathways that cause inflammation in the pouch. They are often used when antibiotics, steroids, or thiopurines are not effective.^7,8

1. Anti-TNF agents (Infliximab, Adalimumab): Research from small studies and meta-analyses shows that these can help,especially in Crohn’s-like pouch disease
2. Vedolizumab:This has been seen to work effectively for chronic pouchitis in clinical trials. It works mainly in the gut,resulting in fewer side effects
3. Ustekinumab: Case studies suggest it can be beneficial for pouchitis that hasn’t responded to other biologics.⁸ It works by targeting the IL-12/23 pathway in the body, which plays a key role in inflammation.⁸

Conclusion

Pouchitis is an inflammation of the ileal pouch, which is a surgically created reservoir after colon removal, caused by conditions like ulcerative colitis. It commonly causes symptoms such as frequent bowel movements, abdominal pain, urgency, and sometimes bleeding. Diagnosis involves reviewing symptoms, endoscopy, and imaging tests.

Most cases respond to antibiotics, but some people develop chronic pouchitis that either depends on or resists antibiotic therapy (CADP or CARP). When this happens, treatment focuses on reducing inflammation and balancing the immune system.

Anti-inflammatory and immune-based treatments include:

• Mesalamine (5-ASA): A mild anti-inflammatory drug that reduces irritation in the pouch lining; best for mild or cuff-related inflammation
• Corticosteroids (e.g., budesonide): Used short-term to reduce inflammation in antibiotic-resistant pouchitis
• Thiopurines (azathioprine, 6-MP): Immunosuppressive medications are sometimes used when pouchitis behaves like Crohn’s disease
• Biologic therapies (infliximab, adalimumab, vedolizumab, ustekinumab): Advanced treatments that target specific immune pathways to control inflammation, especially useful for chronic or severe cases

Overall, treatment is tailored to the severity of symptoms, the individual’s response to treatment, and underlying causes. Most people improve with proper medical care, although long-term follow-up may be needed to manage recurring inflammation.