Dark stools due to..: Dark-colored stools may result from iron supplements, foods you eat (like a lot of spinach), substances (like peptobismol), but most significantly suggests bleeding. When blood is denatured by acid in your stomach, as from ulcers, stools will turn dark. Blood may also be ingested from nose bleeds, bleeding gums... If stools remain dark, even after stopping antacids, then please seek md care.
Answered 7/11/2018
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