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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.
Alcohol Rash. Some people notice that their skin starts to turn red when they are drinking alcohol. This can be embarrassing, particularly if you happen to be out in public when this occurs. As you drink alcohol it can cause the capillaries in your face to dilate, increasing the blood flow to these areas.