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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.
A shade of dark red could mean absolutely nothing or something very significant. Dr. Dragoo explains: The color and consistency of your stool is one of the most important signs of you're underlying health. Bloody stool is either the sign of hemorrhoids or possibly something more serious like cancer. Bloody stool is a particular one that you want to get checked out if you see that.