Discover the top causes of black poop like diet, supplements, and gut health conditions, plus the best treatment options ...

But poop that looks black or bright red can be a sign of bleeding. So, even if you think you know why it's happening, always call your doctor if you have black poop. Black poop causes can vary ...

Medically reviewed by Robert Burakoff, MD Bright red blood in your stool, also known as hematochezia, is a sign of bleeding ...