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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 stool is often a symptom associated with other gastrointestinal complaints and can potentially indicate a stomach related problem. Black stool often appears tarry, can have a foul smell and may show abdominal discomfort too. Stools can appear black due to the presence of blood in it.