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Alcohol dilates peripheral blood vessels, but has been known to actually. constrict some blood vessels in the brain, lowering the oxygen content. Alcohol dilates peripheral blood vessels, but has been known to actually  constrict some blood vessels in the brain, lowering the oxygen content.
Long-term alcohol use can also result in high blood pressure, which increases a personâs risk of heart disease. However, blood pressure can go back to normal within a few months after drinking stops if there is not much damage to the heart. Learn more about how alcohol can affect the heart.