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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.
Stools that are pale, white, or look like clay or putty may be the result of a lack of bile or by a blockage in the bile ducts. Stools that are light in color or look like clay can also occur after a test in the colon that uses barium (such as a barium enema), because the barium may be passed in the stool.