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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.
This is usually the result of bad absorption. Stool that is red or bloody may be a sign of colon disease, internal hemorrhoids, or intestinal parasites. Eating certain foods that are red in color, such as beets, may also add color to stools and urine.Dark stools are usually the result of a diet that is high in iron from foods such as dark greens, iron supplements, or meat.et these stools may be indicative of an underlying dysfunction in the colon. Stool shape and color may provide a better guide to the health of the intestines. Read on to learn more about what your stool shape, form, and color may be saying about your healthâ¦.