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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.
Stool is normally brown due to the digestion of bile salts, which are produced in the liver and stored in the gallbladder. A reduction in bile salts due to liver disease, gall stones, and other conditions causes the stool to be pale. Dark stool can be due to dark foods, medications, or supplements, or may be due to digestive tract bleeding, which can result in red, maroon, or even black, tarry stool.