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Feb 7, 2025 · Hematochezia and melena are two terms that describe different ways blood can appear in your stool. Hematochezia is bright red blood that generally starts lower in th|Melena (black stool) is a symptom of internal bleeding, usually in your upper gastrointestinal (GI) tract. The blood turns black as it travels through your digestive system before #Oct 22, 2025 · Melena refers to black, tarry, sticky stools and usually results from upper gastrointestinal bleeding. The source of bleeding can come from damage to the lining of