Headache after drinking is a relatively common phenomenon in daily life, which is mainly caused by vasodilatation and the stimulation of nerves by alcohol. After drinking, alcohol can be decomposed into acetaldehyde and other substances, which have a great stimulating effect on the human autonomic nerve, can make blood vessels dilate and blood flow increase, which can cause blood pressure to rise, thus appearing the symptoms of headache. Generally manifested as paroxysmal or persistent throbbing pain. After drinking alcohol, alcohol is decomposed in the body, and the substances produced after decomposition, such as amines, can stimulate peripheral nerves, thus causing neurological headache symptoms. After drinking, headache can use ice to cold compress the head, so that the head blood vessel contraction, blood flow reduction, can effectively relieve the pain, in addition, after drinking headache, you can pay attention to drink more water, eat more vegetables and fruits, to promote the excretion of alcohol in the body, is conducive to the alleviation of the symptoms of headache, if necessary, you can apply the analgesic class of drugs, such as nimesulide capsule, to give symptomatic treatment. To summarize, headache after drinking alcohol, mainly due to the alcohol on the vasodilatation and the stimulation of the nerves caused. If you often have headaches after drinking alcohol, it is recommended not to drink alcohol.