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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.
Learning What Different Stool Colors May Indicate. 1  1. Check for red or black stools. These could both potentially be a sign of something going wrong in your digestive system. 2  2. Look out for white, gray, or light-colored stool. Bile contributes to the coloring of stool, so this lack of color could actually indicate the absence of bile.