The headache that appears the day after drinking is considered to be related to the incomplete metabolism of alcohol. The residual alcohol in the body will cause cerebral vasodilation, and cerebral vasodilation will cause an increase in cerebral blood flow, thus causing a headache. The headache is often persistent vascular pulsation-like and head swelling pain. The following measures can be taken when a headache occurs: 1. you need to stop working and rest in bed. 2. pay attention to opening windows and ventilation to promote air circulation. 3. you can massage the sun properly, or you can use a cool towel to wet compress the temples to prevent excessive expansion of blood vessels. 4. you can drink more sugar water or honey water to promote alcohol metabolism through osmotic diuresis. 5. you can take appropriate oral painkillers, such as ibuprofen, acetaminophen, etc. In addition to alcohol-induced vasodilatation, headache should be considered as a combination of acute cerebrovascular disease, such as cerebral infarction and cerebral hemorrhage. If you have severe headache and the effect of oral painkillers is not good, you should go to the hospital and if necessary, perform a cranial CT examination to exclude intracranial organic lesions.