The reasons for headache after drinking are as follows: first, consider the stimulating effect of alcohol on human blood vessels, alcohol contains ethanol, ethanol makes human blood vessels appear mildly dilated, accelerating blood circulation, drinking too much alcohol makes blood vessels dilate more obviously, headache will be serious nausea, vomiting phenomenon. Secondly, the headache after drinking can be seen clinically in some patients with arteriosclerosis and vascular spasm, who drink alcohol to stimulate vascular spasm and headache, and if necessary, take oral medication to relieve cerebral vascular spasm. Then, the headache after drinking is considered to be due to the patient’s history of migraine headache, and the acute attack of migraine headache is triggered by drinking spicy and stimulating alcohol.