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Bright red streaks may indicate bleeding low in the GI tract, while tarry black or maroon stools can be caused by bleeding in the stomach or small intestines. Clay-colored or pale yellow stools can be caused by problems with the liver, gallbladder or pancreas.
Bright red stool usually suggests that blood is coming from the lower part of the digestive system, such as the large intestine, rectum or anus. Pale white or yellow stool also can mean a problem. The reason why stool is brown is because of our normal production of bile, Raufman said.