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

Generally speaking, a normal stool is brown thanks to the presence of a bile pigment called stercobilin—it's produced when ...

Blood in the stool can make it appear red or even black. The brighter the color of red in the poop, the lower in the intestines the bleeding occurs. Mucus can appear white or yellowish.

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 ...