A lower gastrointestinal bleed is defined as bleeding originating distal to the ileocecal valve which includes the colon, rectum, and anus. LGIB was previously defined as any bleed that occurs distal to the ligament of Treitz, which included the aforementioned parts of the intestine and also included the last 1/4 of the duodenum and the entire area of the jejunum and ileum. This has been divided into middle gastrointestinal bleeding (from the ligament of Treitz to the ileocecal valve) and lower gastrointestinal bleeding which involves a bleed anywhere from the ileocecal valve to the anus.