Lower gastrointestinal bleeding is an umbrella term for bleeding that occurs in the large intestine or rectum. Some synonyms for lower gastrointestinal bleeding include lower GI tract bleeding, rectal bleeding, colon bleeding, and lower digestive tract hemorrhage. Other related terms may include hematochezia (passage of blood in stools), melena (dark, tarry stools), and hematemesis (vomiting of blood). It is important to identify the source of bleeding in the lower gastrointestinal tract, as it may indicate various conditions, including inflammatory bowel disease, diverticulitis, hemorrhoids, or colon cancer. Identifying the cause of bleeding is essential for proper diagnosis and treatment.