Incidence and prevalence of<unk>  nears those of ulcerative colitis and Crohn's disease. Studies in North America found incidence rates of 7.1 per 100,000 person-years and 12.6 per 100,000 person-years for collagenous colitis for lymphocytic colitis, respectively. Prevalence has been estimated as 103 cases per 100,000 persons. People who develop<unk>  are characteristically, though not exclusively, middle-aged females. The average age of diagnosis is 65 but 25% of cases are diagnosed below the age of 45.
Microscopic colitis
Bile acid malabsorption
Collagenous colitis
Coeliac disease
Lymphocytic colitis
Crohn's disease
Cytomegalovirus colitis
Lactose intolerance