Gastrointestinal hemorrhage Hematochezia SNOMEDCT_US:405729008 Recurrent rectal bleeding HP:0002609 UMLS:C0018932 Rectal bleeding HP:0002573 Bright red blood in stool, most frequentoly caused by hemorrhoids or diverticulosis. HP:0002255 SNOMEDCT_US:236068001 The passage of fresh (red) blood per anus, usually in or with stools. Most rectal bleeding comes from the colon, rectum, or anus. Bloody diarrhea