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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.
Green or yellow stool is usually caused by your bowels moving too fast, as with mild diarrhea. Bile, the main pigment in poop, starts out green and turns brown over time. Pale gray or yellow feces may indicate liver disease. 2. Look for signs of blood. Take note of any stool that is red or pitch black in color.