In rare cases, bowel diseases can lead to complications. With Crohn's disease, intestinal obstruction is a possible complication that must be treated immediately. The formation of scars after a relapse can lead to constrictions which, in the worst-case scenario, can lead to intestinal obstruction. It is also possible that intestinal ruptures may occur where objects in the intestine can enter the abdominal cavity and can trigger life-threatening infections. In such emergencies, you must seek immediate medical treatment.Complications are also possible with ulcerative colitis. Not only can intestinal perforation occur, but also a toxic megacolon. This, in turn, can lead to a life-threatening intestinal obstruction. In some cases, this can also lead to bleeding in the intestine which can lead to severe blood loss. If this happens, blood transfusions and surgery may be necessary.