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Yellow/Pale Brown/Grey: Bright yellow diarrhea can signify a condition known as Giardiasis (see sidebar). Stool that is yellow or pale can also result from reduced production of bile salts, since a normal, brown-coloured stool acquires its hue from breaking down bile.
Yellow Mucus in Stool. Yellow stool may be an indication of the presence of undigested fat in the feces. This may happen as a consequence of pancreatic disorders such as Chronic Pancreatitis that lowers digestive enzyme delivery to the intestines.