MEDICAL PHYSIOLOGY

Detailed explanation-1: -Black or tarry stools may be due to bleeding in the upper part of the GI (gastrointestinal) tract, such as the esophagus, stomach, or the first part of the small intestine. In this case, blood is darker because it gets digested on its way through the GI tract.

Detailed explanation-2: -If you’re experiencing diarrhea and your poop is red, it could be a sign that you have a viral or bacterial infection, like an E. coli infection, or rotavirus, which is sometimes called the stomach flu, or a stomach bug. Red poop may also be the result of bleeding in the lower part of your digestive tract.