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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.
Changes in Stool Color. Certain stool colors can signify health problems. These include: Red or maroon stool: referred to as hematochezia and may indicate gastrointestinal bleeding that originates from the colon.Red colored stool may also be a result of ingesting certain foods such as beets, rhubarb, radishes and turnips.lack stool: may indicate bleeding in the stomach or the upper part of the small intestine. Black stool that results from a gastrointestinal bleeding is often associated with a tarry texture and foul odor. Iron pills or certain medications, like Pepto Bismol, may also cause black stool.