Type of disease: Rare conditions
Collagenous colitis is a type of inflammatory bowel disease that affects the colon. It is a form of microscopic colitis, which means that the inflammation is only visible when a biopsy is examined under a microscope; the inflammation cannot be seen or diagnosed from colonoscopy or sigmoidoscopy. Signs and symptoms may be ongoing or intermittent and may include chronic, watery, non-bloody diarrhea and abdominal pain or cramps. The exact underlying cause is unknown but may relate to a bacteria, a virus, an autoimmune response, and/or a genetic predisposition. Treatment for collagenous colitis varies depending on the symptoms and severity in each individual. In some cases, the condition resolves on its own.Source: Genetic and Rare Diseases Information Center (GARD), supported by ORDR-NCATS and NHGRI.