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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.
Prolonged yellow stool may also be caused by conditions such as giardiasis or gastroesophageal reflux disease (GERD). Yellow stool may also indicate problems with the gallbladder and liver. Bile salts from the liver give stool its brownish color and when bile output is diminished, it may first appear as yellow stool.