<unk>  <unk>  is a chronic disease characterized by recurrent episodes of diffuse inflammation limited to the mucosal layer of the colon and presenting commonly as bloody diarrhea with rectal urgency and tenesmus.  It commonly involves the rectum and may extend proximally in a symmetrical, circumferential, and uninterrupted pattern to involve parts of or even the entire large intestine.
Ulcerative colitis
Drug-induced colitis
Allergic colitis
Pseudomembranous colitis
Microscopic colitis
Chemical colitis
Ischemic colitis
Crohn's disease