Ulcerative colitis and
Crohn's disease are the most common forms of
inflammatory bowel disease (IBD). Some people have a nonspecific form of IBD
that is like ulcerative colitis but doesn't have all its features. This may be
a different type of ulcerative colitis.
For up to 10% of people who have symptoms, neither Crohn's disease
nor ulcerative colitis can be diagnosed.1 These people
have a form of IBD called indeterminate colitis, which doctors believe is a
combination of Crohn's disease and ulcerative 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.
It's called microscopic because the inflammation is too small to see with the naked eye. The only way your doctor can diagnose it is to take a sample of tissue and check it under a microscope.
There are two types of microscopic colitis: