<unk> 's<unk>  can affect any part of the gastrointestinal tract expect rectum.<unk> 's<unk>  may be classified based on the area of involvement and based on the behavior of the<unk>  progression.
Crohn's disease classification
Inflammatory bowel disease classification
Ulcerative colitis classification
Irritable bowel syndrome classification
Gastritis classification
Diverticulosis classification
Peptic ulcer classification
Ischemic colitis classification