Medically reviewed by Qin Rao, MD Noticing grey poop may come as a surprise, but it's not always an emergency. Grey poop ...

Green poop in kids is a typical occurrence caused by dietary factors such as green vegetables or fruits and food coloring.

Those with liver issues should be alert to changes in stool color. Black stool can also be a sign of colorectal cancer, especially if there's bleeding in the upper gastrointestinal tract.