Hematochezia vs. melena: What's the difference? UT MD Anderson The Self Limited Nature of Chronic Idiopathic Diarrhea New England Journal of Medicine MALENA: Melena is the medical term for black, tarry stools caused by the presence of digested blood. It typically indicates bleeding in the upper gastrointestinal (GI) tract, such as the: Stomach Duodenum Why Is My Stool Black? Symptoms, Causes & What To Do Next
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