Eat iron pieces and shit black.

Eat iron-containing drugs show black stool, is related to drugs, when stopping the use of drugs for 3 days, stool color will turn normal. In the stool routine and occult blood, is also normal. In addition to iron-containing drugs, eat bismuth agent will also cause stool color black. Diet in eating chicken blood, duck blood, pig blood, etc., will also cause stool color black. If there are no dietary factors and drug factors, black stool must go to the digestive department of the local hospital for treatment, test stool occult blood, understand whether there is the possibility of gastrointestinal bleeding, and be sure to conduct regular follow-up.