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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)
Black stools can also be caused by supplements such as iron or medicines such as Pepto-Bismol. Certain foods, like blueberries or black licorice, can also turn the stool black. Your doctor can tell if there is any blood in the stool by taking a stool sample from the rectum and performing a simple test in the office. If you are having any black or tarry stools, call your doctor right away.