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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.
1 Itâs often normal for stool to change color. 2  In some cases, yellow stool may be a result of liver disorders, diet changes, or stress.  If yellow stool persists for several days, or if it is accompanied by other symptoms, you should contact your doctor.