Hello, My son is allergic to milk. He has many symptoms, not always together at the same time. The most obvious reaction to any dairy, happens 4 hours later. He starts screaming in pain, it's hard to talk to him, to find out exactly where he hurts. But mainly it's his joints, back, and head. He can't walk, stretch out his legs, or barley sit up. Tylenol helps ease the pain. He is so sensitive, he can not even have 1 mcDonald's french fry, because it turns out they have milk.