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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 be due to iron supplements or excess iron in the diet. The most serious cause of black stools is bleeding in the GI tract, due to ulcers or some other cause. If the stool is black due to blood, it usually has a tarry feel. If there is just a black color, most likely it is not blood.