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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)
So knowing what causes black stool is important to ease your worries, or get you to the doctor -- stat! Bleeding that happens in the esophagus, stomach, or the first part of the small intestine is the most common cause of a stool that appears black or tarry, according to the National Institutes of Health. Bleeding in the upper part of the gastro-intestinal, or GI, tract will usually cause black stools due to: