Collagenous colitis (CC) is a type of microscopic colitis (the only other type being lymphocytic colitis) whereby a layer of collagen forms inside tissue of the colon. Another definition of collagenous colitis is that it is a kind of inflammatory bowel disease. Sufferers of the condition may experience watery diarrhea and pain in the belly. … Continue reading What causes collagenous colitis? Symptoms, treatment, diet, and prognosis