Drinking milk generally does not cause headache symptoms, but if you have headache after drinking milk, you need to consider whether there are other conditions, as follows: 1. If you have headache after drinking milk every time, you need to consider whether it is because of milk allergy, or it is related to the body’s intolerance to milk, it is recommended to go to the hospital to check the blood analysis, and allergen determination, if the body is intolerant, usually should not drink milk again; 2. Drinking milk as water every day and very little water will lead to too little water in the blood, the blood viscosity is too high, resulting in slow blood transmission, resulting in insufficient oxygen supply to the brain and headache symptoms.