[Inflammatory bowel disease--Crohn's disease].

Acute massive hemorrhage from CD occurred in 3.0% in our institution. Forty CD patients with massive hemorrhage were reported in last 20 years in Japan. The ratio of male to female was 7.0. Ninety percent of them complicated the small intestinal CD. Massive bleeding was seen mostly in the ileum (82.5%) and next was in the colon (12.5%). However massive gastrointestinal hemorrhage is not often complicated in Crohn's disease, acute massive hemorrhage is occasionally critical. Therefore it is considered that CD should be treated carefully.