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1 Passing black, tarry stools and Blood in stools as in case of inflammatory bowel disease (16 causes) 2  Passing black, tarry stools and Bloody stool (16 causes)  Passing black, tarry stools and Abdominal symptoms (15 causes)
What is black stool? Black stool is a condition in which the feces are very dark or black in color. Black stool may be normal in some cases and caused by ingesting certain substances or medications, such as iron supplements. 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.