The symptoms of headache after taking a bath are considered to have two reasons: 1, insufficient blood supply to the brain. In the process of bathing, the body can sweat, the skin’s microcirculation is open, and the effective circulation of the body’s blood volume is limited, resulting in insufficient blood supply to the brain caused by headache.2, in the process of bathing, the patient consumes physical strength is likely to have hypoglycemia, the brain does not have stored glycogen, and when the blood glucose decreases, so that the metabolism of the brain cells to occur in the obstacle to headache. Therefore, patients should try to drink more sugar water before taking a bath, not only to avoid the symptoms of insufficient blood supply to the brain after taking a bath, but also to avoid the symptoms of hypoglycemia after taking a bath. It is recommended that patients can also drink warm water or sugar water while bathing.