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Low blood pressure after drinking headache is generally caused by vasodilation.

Alcohol contains a lot of alcohol, belongs to a stimulating drink. If a large number of drinks, may stimulate the human blood vessels, nerves, leading to vasodilation, so that peripheral vascular resistance decreased, relative blood volume decreased, resulting in low blood pressure. Blood pressure is the driving force to promote blood flow in blood vessels. The decrease of blood pressure can lead to the decrease of blood flow velocity in blood vessels. In addition, the relative blood volume decrease caused by vasodilation can cause insufficient blood supply and oxygen supply to brain tissue, thus causing headache symptoms.