What Is a Hangover?

When you drink, alcohol goes into your bloodstream. Your blood-alcohol concentration (BAC) measures how much is in your blood. The higher your BAC, the more intoxicated you feel. When you stop drinking, your BAC begins to drop. Hangover symptoms are at their worst when that level returns to zero and usually last about 24 hours. The fact that we feel worse after the alcohol has left our bodies has long been a mystery to researchers.

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