When i drink milk i always have running stomach what's the cause of this ?

Lactose Intolerance: By description , this is lactose intolerance. Use lactose free milk(lactaid) or soy milk. Internet search lactose free diet for specific foods and beverages to avoid.P.

Lactose intolerance: Some people lose their ability to digest milk sugar (lactose) as they grow up. This is more common in people of asian descent, but can happen to anyone. Enzyme pills (lactase, or "Lactaid") taken before meals can prevent diarrhea. Drinking a small and gradually increasing amount of milk every day can reactivate your body's natural ability to digest milk and other dairy products.