<unk> , commonly abbreviated<unk> , is any form of gastrointestinal bleeding in the<unk>  gastrointestinal tract.<unk>  is a common reason for seeking medical attention at a hospital's emergency department.<unk>  accounts for 30–40% of all gastrointestinal bleeding and is less common than upper gastrointestinal bleeding (UGIB). It is estimated that UGIB accounts for 100–200 per 100,000 cases versus 20–27 per 100,000 cases for<unk> . Approximately 85% of<unk>  involves the colon, 10% are from bleeds that are actually upper gastrointestinal bleeds, and 3–5% involve the small intestines.
Lower gastrointestinal bleeding
Upper gastrointestinal bleeding
Internal bleeding
Rectal bleeding
Gastric varices
Gastrointestinal bleeding
Retroperitoneal bleeding
Nosebleed