Lower GI bleeding may present as hematemesis, which is the regurgitation of blood or blood mixed with stomach contents.

Black, tarry stool, also called melena, is indicative of a lower gastrointestinal disease that causes bleeding.

Black, tarry stool, also called melena, is indicative of an upper gastrointestinal disease that causes bleeding.

Upper GI bleeding may present as hematochezia, which is the passing of bright red blood via the rectum.