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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.
1 Dry, dark-brown stool means excessive heat is present in the large intestine. 2  Loose stools with a fishy odor pertain to excessive cold in the intestines.  Extremely dry and hard stool is often seen in a deficiency of blood or body fluids.