Microscopic colitis: Microscopic colitis is a type of inflammation of the colon, or large intestine,that can cause watery diarrhea and cramping. While it can be painful and unpleasant, it's much less severe than other types of inflammatory bowel disease. 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. In switzerland collagenous colitis 3.4-4.4/100000 per year microscopic colitis 4.7/100000 per year.
Tests and diagnosis: A complete medical history and physical examination can help determine whether other conditions may be contributing to your diarrhea, including: Celiac disease, Autoimmune disorders, such as rheumatoid arthritis. Stool sample analysis to help rule out infection as the cause of persistent diarrhea.Blood test or upper endoscopy with biopsy to rule out celiac disease. In endoscopy, a long, thin tube with a camera on the end is used to examine the upper part of your digestive tract. A tissue sample (biopsy) may be removed for analysis in the laboratory.