When the headache occurs the day after drinking alcohol, the patient can take oral medication for pain relief, such as oral blood and brain-clearing granules, or oral Lozon tablets or ibuprofen tablets. Patients can also skip medication and drink more hot water or fresh fruit juice, after which they can eat more watermelon. When the amount of fluid in the body is fully replenished, then eat watermelon, which has a diuretic effect and will promote metabolism in the body, and alcohol and the miscellaneous alcoholic oils in alcohol, which can be metabolized from the body quickly. Patients can also drink more water, take a hot bath, and get some sleep, and the symptoms of headache after drinking alcohol will be relieved.