Print Overview Colon and rectum Enlarge image Close Colon and rectum Colon and rectum The colon is a long tubelike organ in the abdomen. It's the longest part of the large intestine. The colon carries waste to be expelled from the body. The rectum makes up the last several inches of the colon. Microscopic colitis is an inflammation of the large intestine (colon) that causes persistent watery diarrhea. The disorder gets its name from the fact that it's necessary to examine colon tissue under a microscope to identify it, since the tissue may appear normal with a colonoscopy or flexible sigmoidoscopy. There are different subtypes of microscopic colitis: Collagenous colitis, in which a thick layer of protein (collagen) develops in colon tissue Lymphocytic colitis, in which white blood cells (lymphocytes) increase in colon tissue Incomplete microscopic colitis, in which there are mixed features of collagenous and lymphocytic colitis. Researchers believe collagenous (kuh-LAYJ-uh-nus) colitis and lymphocytic colitis may be different phases of the same condition. Symptoms, testing and treatment are the same for all subtypes.Products & ServicesA Book: Mayo Clinic on Crohn’s Disease and Ulcerative ColitisA Book: Mayo Clinic on Digestive HealthShow more products from Mayo Clinic SymptomsSigns and symptoms of microscopic colitis include: Chronic watery diarrhea Abdominal pain, cramps or bloating Weight loss Nausea Fecal incontinence Dehydration The symptoms of microscopic colitis can come and go frequently. Sometimes the symptoms resolve on their own. When to see a doctorIf you have watery diarrhea that lasts more than a few days, contact your doctor so that your condition can be diagnosed and properly treated. Request an appointment There is a problem with information submitted for this request. Review/update the information highlighted below and resubmit the form. Get the latest health information from Mayo Clinic delivered to your inbox. Subscribe for free and receive your in-depth guide to digestive health, plus the latest on health innovations and news. You can unsubscribe at any time. Click here for an email preview. Email address ErrorEmail field is required ErrorInclude a valid email address Subscribe Learn more about Mayo Clinic’s use of data. To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and website usage information with other information we have about you. If you are a Mayo Clinic patient, this could include protected health information. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. Thank you for subscribing Your in-depth digestive health guide will be in your inbox shortly. You will also receive emails from Mayo Clinic on the latest health news, research, and care. If you don’t receive our email within 5 minutes, check your SPAM folder, then contact us at newsletters@mayoclinic.com. Sorry something went wrong with your subscription Please, try again in a couple of minutes Retry CausesIt's not clear what causes the inflammation of the colon found in microscopic colitis. Researchers believe that the causes may include: Medications that can irritate the lining of the colon. Bacteria that produce toxins that irritate the lining of the colon. Viruses that trigger inflammation. Autoimmune disease associated with microscopic colitis, such as rheumatoid arthritis, celiac disease or psoriasis. Autoimmune disease occurs when your body's immune system attacks healthy tissues. Bile acid not being properly absorbed and irritating the lining of the colon. Risk factorsRisk factors for microscopic colitis include: Age. Microscopic colitis is most common in people ages 50 to 70. Sex. Women are more likely to have microscopic colitis than are men. Some studies suggest an association between post-menopausal hormone therapy and microscopic colitis. Autoimmune disease. People with microscopic colitis sometimes also have an autoimmune disorder, such as celiac disease, thyroid disease, rheumatoid arthritis, type 1 diabetes or psoriasis. Genetic link. Research suggests that there may be a connection between microscopic colitis and a family history of irritable bowel syndrome. Smoking. Recent research studies have shown an association between tobacco smoking and microscopic colitis, especially in people ages 16 to 44. Some research studies indicate that using certain medications may increase your risk of microscopic colitis. But not all studies agree. Medications that may be linked to the condition include: Pain relievers, such as aspirin, ibuprofen (Advil, Motrin IB, others) and naproxen sodium (Aleve) Proton pump inhibitors including lansoprazole (Prevacid), esomeprazole (Nexium), pantoprazole (Protonix), rabeprazole (Aciphex), omeprazole (Prilosec) and dexlansoprazole (Dexilant) Selective serotonin reuptake inhibitors (SSRIs) such as sertraline (Zoloft) Acarbose (Precose) Flutamide Ranitidine Carbamazepine (Carbatrol, Tegretol) Clozapine (Clozaril, Fazaclo) Entacapone (Comtan) Paroxetine (Paxil, Pexeva) Simvastatin (Zocor) Topiramate ComplicationsMost people are successfully treated for microscopic colitis. The condition does not increase your risk of colon cancer. By Mayo Clinic Staff Microscopic colitis care at Mayo Clinic Request an appointment Diagnosis & treatment Jan. 20, 2021 Print Show references Microscopic colitis: Collagenous colitis and lymphocytic colitis. National Institute for Diabetes and Digestive and Kidney Diseases. https://www.niddk.nih.gov/health-information/digestive-diseases/microscopic-colitis. Accessed Jan. 5, 2021. Feldman M, et al., eds. Other diseases of the colon. In: Sleisenger and Fordtran's Gastrointestinal and Liver Disease: Pathophysiology, Diagnosis, Management. 11th ed. Elsevier; 2021.https://www.clinicalkey.com. Accessed Jan. 5, 2021. Pardi DS, et al. American Gastroenterological Association Institute technical review on the medical management of microscopic colitis. Gastroenterology. 2016;150:247. What is microscopic colitis? Crohn's and Colitis Foundation. https://www.crohnscolitisfoundation.org/what-is-microscopic-colitis. Accessed Dec. 16, 2020. Dietrich CF. Microscopic (lymphocytic and collagenous) colitis: Clinical manifestations, diagnosis, and management. https://www.uptodate.com/contents/search. Accessed Jan. 5, 2021. Burke KE, et al. Identification of menopausal and reproductive risk factors for microscopic colitis—Results from the Nurses' Health Study. Gastroenterology. 2018; doi: 10.1053/j.gastro.2018.08.029. Bonderup OK, et al. Significant association between the use of different proton pump inhibitors and microscopic colitis: A nationwide Danish case‐control study. Alimentary Pharmacology and Therapeutics. 2018;48:618. Topiramate. IBM Micromedex. https://www.micromedexsolutions.com. Accessed Jan. 5, 2021. AskMayoExpert. Microscopic colitis (adult). Mayo Clinic; 2019. Camillari M, et al. Pathophysiology, evaluation, and management of chronic watery diarrhea. Gastroenterology 2017;152:515. Diarrhea nutrition therapy. Nutrition Care Manual. Academy of Nutrition and Dietetics. https://www.nutritioncaremanual.org. Accessed Nov. 12, 2018. Brown AY. Allscripts EPSi. Mayo Clinic. Dec. 22, 2020. Rajan E (expert opinion). Mayo Clinic, Rochester, Minn. Nov. 24, 2018. Related Products & Services A Book: Mayo Clinic on Crohn’s Disease and Ulcerative Colitis A Book: Mayo Clinic on Digestive Health Show more products and services from Mayo Clinic Microscopic colitisSymptoms&causesDiagnosis&treatmentDoctors&departmentsCare atMayoClinic Advertisement Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission. Advertising & Sponsorship Policy Opportunities Ad Choices Mayo Clinic Press Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press. 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There is a problem with information submitted for this request. Review/update the information highlighted below and resubmit the form. Get the latest health information from Mayo Clinic delivered to your inbox. Subscribe for free and receive your in-depth guide to digestive health, plus the latest on health innovations and news. You can unsubscribe at any time. Click here for an email preview. Email address ErrorEmail field is required ErrorInclude a valid email address Subscribe Learn more about Mayo Clinic’s use of data. To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and website usage information with other information we have about you. If you are a Mayo Clinic patient, this could include protected health information. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. Thank you for subscribing Your in-depth digestive health guide will be in your inbox shortly. You will also receive emails from Mayo Clinic on the latest health news, research, and care. If you don’t receive our email within 5 minutes, check your SPAM folder, then contact us at newsletters@mayoclinic.com. Sorry something went wrong with your subscription Please, try again in a couple of minutes Retry