Some diarrhea medications can cause changes in stool color, such as black or white stool. However, passing white stools can indicate a serious medical condition, such as a blocked bile duct or liver ...

Sudden black, tar-like stools, medically termed melena, often signal internal bleeding in the stomach or upper intestine, according to a 2021 study. While some foods or supplements can cause temporary ...

Finding your stool suddenly dark black and tar like can be deeply unsettling. Many people immediately assume it is caused by something they ate, but a drastic colour change, especially when the stool ...