Black poop can be caused by foods or medications. Stool may also be black becasue of blood in the digestive tract, known as melena. A small drop of red blood is usually due to minor hemorrhoids but ...

The Color Check You Should Not Skip Healthy poop is usually medium to dark brown. That tells you digestion is doing its job.

Foul-smelling stool on its own is usually not a sign of cancer. Generally, it comes from diet or harmless digestive issues.