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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.
Dark stool is caused by upper GI tract bleeding. Generally, we get concerned when we see blood or red-tinged feces, but dark, tarry stool can indicate that something is wrong and is as much of a concern as red, obviously bloody stool. Tarry, black stool is called melena, and it is often foul smelling.