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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.
When it comes to frequency, color, shape, and size, a general rule of thumb is that normal bowel movements are defined as whatâs comfortable for you. But being knowledgeable about your digestive process can help you identify when normal goes awry.olor can be a red flag when itâs a drastic change, Aserkoff says. âIf stool is black, it can mean that you are bleeding internally, possibly as a result of an ulcer or cancer ,â he says. Stool that is black due to bleeding is also sticky (tarry) and smells bad.