What would cause a white stool?

White stool: Stools can be of different color by one's intake. Alot of antacids or a recent barium test could possible be a cause. However if this persists liver disorders need to be ruled out. A white (or clay colored stool) can signify lack of bile salts and an underlying liver condition. I would take this seriously and see your pcp asap.

Not normal: White stool is usually caused by a lack of bile which is secreted by the gallbladder. It needs to be evaluated by your physician.