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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.
Bile is what gives stool its brown color, so if bile is not being produced or if the bile ducts are blocked, the result could be stool that is light. Common causes of stool that is pale or clay colored include: 1  Alcoholic hepatitis.  Biliary cirrhosis.