Drinking warm milk on your period may not be significantly harmful, but if you are allergic to milk, you may experience an allergic reaction. Milk contains some protein. When menstruating, if a woman drinks warm milk, she can replenish some of the nutrients and it may not cause any obvious harm to her health. If the female patient belongs to the allergic body, allergic to milk and other protein-rich foods, drinking milk with menstruation may cause an allergic reaction, manifested as rash, itching, and diarrhea symptoms. Female menstruation, according to the individual’s physical condition to determine whether it is appropriate to drink milk, but also to do a good job of perineal cleanliness and hygiene care, and develop good living habits.