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However, black stool can also be caused by a serious condition, such as bleeding in the digestive tract caused by a peptic ulcer. Black stool that is tarry in texture and foul smelling is often a symptom of upper gastrointestinal bleeding from the esophagus, stomach or small intestine.This is called melena.nswers. Best Answer: Adam, black stool can have several causes. Black stool is a condition in which the feces are very dark or black. Black stool may be normal in some cases and caused by ingesting certain substances or medications, such as iron supplements.
Black stools can be a symptom of a serious condition, such as esophageal varices or peptic ulcer. Seek prompt medical care if you have unusually dark stools or any change in the color or texture of your stool. If your stools are black and tarry in texture, bloody, or if you have major rectal bleeding, seek immediate medical care (call 911) .