Diarrhea is a sign common to both lactose maldigestion and lactose intolerance.

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Diarrhea is a common sign of both lactose maldigestion (which means a decreased ability to digest lactose) and lactose intolerance (which is the symptomatic response to the maldigestion of lactose). Both conditions can cause diarrhea due to undigested lactose reaching the colon and causing an osmotic effect that draws water into the colon, leading to loose stools.

Diarrhea Is a Sign Common to Both Lactose Maldigestion and Lactose