title: Three reasons for ulcerative colitis.
mesh_terms: D000208:Acute Disease; D000368:Aged; D001424:Bacterial Infections / Q000150:complications; D002908:Chronic Disease; D003093:Colitis, Ulcerative / Q000209:etiology*; D003106:Colon / Q000098:blood supply; D005260:Female; D006801:Humans; D007413:Intestinal Mucosa / Q000098:blood supply; D014777:Virus Diseases / Q000150:complications