 [ Symptoms ] what would cause discoloration of your stool specifically a black color  on november 15th i experienced virus like symptoms i was having headaches body aches and i also had diarrhea on november 17th i began taking pepto bismol and imodium i could hear gas like noises in my stomach the diarrhea stopped and i did not have a bowel movement until nov 19th every movement since then has had a black color what could cause this black color  [ Disease ] it is the pepto it happens to me every time i take it and if you read all the warnings on the package it even says you may notice a change in your stool color nothing to be too alarmed by but if you are still taking the pepto try laying off for a day or two and see if that helps