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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.
Your stool can actually come out in a variety of colors. For example, black poop may indicate bleeding in the upper gastrointestinal tract, most likely the stomach. It could be caused by iron supplements, Pepto-Bismol, or (oddly enough) black licorice. Light-colored, white, or clay-colored poop usually means a lack of bile in your stool or bile duct obstruction. Possible dietary causes include certain medications like anti-diarrheal drugs.