Black stool examination without blood, may be due to dietary factors, drug factors and other reasons, usually do not need special treatment. 1. Dietary factors: Eating black food, such as black sesame, black beans, fungus and other foods, because the pigment in the food is relatively rich, not completely digested and absorbed, and discharged into the intestine and feces mixed together, so the discharge of black stool. Eat some animal liver, such as chicken liver, pig liver, animal blood products, such as chicken blood, duck blood, pig blood, etc., because these foods contain iron is relatively high, into the intestinal tract after oxidation to form sulfide, so there will be a row of black stools, fecal routine examination did not find a positive fecal occult blood, usually do not need special treatment, change the dietary structure, and can be gradually returned to normal. 2. Drug factors: taking Chinese patent medicine or Chinese medicine soup, iron, bismuth, such as ferrous sulfate, bismuth potassium citrate, colloidal bismuth, etc., there will also be black stools, fecal examination does not have fecal occult blood positive, after stopping these medications can be restored to the normal color of the bowel.
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