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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 usually brown due to bilirubin, a substance made from hemoglobin that is produced when the liver processes dead, used-up red blood cells and gets them ready for secretion. Bilirubin starts off as yellow before it is secreted from the liver as bile, which is yellow/green.