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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.
One of the leading causes of dark stools is chronic heartburn. Heartburn involves the regurgitation of acids from the stomach into the esophagus, typically resulting in a burning pressure or pain from the breast bone up the throat. The pain is usually worse with bending, lying down, or after eating.