Why do I get headaches every time I drink alcohol? The main reasons for headache after every drink are as follows: First, if a patient with hypertension has a headache after every drink, because a large amount of alcohol can easily cause an increase in blood pressure, and after the blood pressure rises to a certain level, it exceeds the regulation of the patient’s own blood flow in the brain, which can easily cause headache, dizziness, nausea and vomiting; second, why does a headache occur after every drink? Headache is also seen in some patients with migraine, which can be caused by acute attacks of migraine after drinking alcohol, manifesting as one-sided or bilateral headache, mainly throbbing pain, and serious nausea and vomiting; third, headache after drinking alcohol is mostly seen in some patients with atypical seizures, which may also be triggered after drinking alcohol. This may be triggered by alcohol consumption.