Headaches after drinking alcohol are usually caused by vascular headache, which is the most common type of primary headache and is often triggered by alcohol consumption. This is because after alcohol is ingested into the body, it can increase nerve excitability and dilate blood vessels, and these two factors interact with each other to increase blood flow in the brain, as well as increase blood pressure and intracerebral pressure. At this time, the content of the brain is equal to the original become larger, but the volume of the skull is still fixed, will produce high cranial pressure symptoms, and at the same time the dilation of blood vessels will pull to the pain-sensitive tissues, feel obvious throbbing pain or swelling pain. In this case, it is recommended that the patient rests in bed, and if necessary, a small amount of mannitol can be infused intravenously to be able to dehydrate and lower the intracranial pressure, and certain pain medications can also be taken temporarily. If the pain is not severe, after a night’s sleep and rest, most of them can be relieved on their own.