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Causes
By Mayo Clinic staffLike Crohn's disease, ulcerative colitis causes inflammation and ulcers in your intestine. But unlike Crohn's, which can affect the colon in various sections, ulcerative colitis usually affects one continuous section of the inner lining of the colon beginning with the rectum.
No one is quite sure what triggers ulcerative colitis, but there's a consensus as to what doesn't. Researchers no longer believe that stress is the main culprit, although stress can often aggravate symptoms. Instead, current thinking focuses on the following possibilities:
- Immune system. Some scientists think a virus or bacterium may trigger ulcerative colitis. The digestive tract becomes inflamed when your immune system tries to fight off the invading microorganism (pathogen). It's also possible that inflammation may stem from an autoimmune reaction in which your body mounts an immune response even though no pathogen is present.
- Heredity. Because you're more likely to develop ulcerative colitis if you have a parent or sibling with the disease, scientists suspect that genetic makeup may play a contributing role.
- About ulcerative colitis and proctitis. The Crohn's and Colitis Foundation of America. http://www.ccfa.org/info/about/ucp. Accessed June 30, 2009.
- Ulcerative colitis. The Merck Manuals: The Merck Manual for Healthcare Professionals. http://www.merck.com/mmpe/print/sec02/ch018/ch018c.html. Accessed June 30, 2009.
- Peppercorn MA, et al. Medical management of ulcerative colitis. http://www.uptodate.com/home/index.html. Accessed June 30, 2009.
- Ulcerative colitis. National Institute of Diabetes and Digestive and Kidney Diseases. http://digestive.niddk.nih.gov/ddiseases/pubs/colitis/. Accessed June 30, 2009.
- Accutane (prescribing information). Nutley, N.J.: Roche; 2008. http://www.rocheusa.com/products/accutane/pi.pdf. Accessed June 23, 2009.
- Inflammatory bowel disease. In: Rakel RE, et al. Conn's Current Therapy 2008. 60th ed. Philadelphia, Pa.: Saunders Elsevier; 2008. http://www.mdconsult.com/das/book/body/144932667-4/854785995/1621/261.html#4-u1.0-B978-1-4160-4435-2..50133-3--cesec17_2085. Accessed June 21, 2009.
- Rutgeerts P, et al. Biological therapies for inflammatory bowel diseases. Gastroenterology. 2009;136:1182.
- Enck P. Acupuncture treatment in gastrointestinal diseases: A systematic review. World Journal of Gastroenterology. 2007;13:3417.
- Picco MF (expert opinion). Mayo Clinic, Jacksonville, Fla. July 20, 2009.
