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Hair of the dog: does another drink actually cure a hangover?
"Hair of the dog that bit you" is centuries old, and the logic sounds almost medical: if alcohol caused the problem, a little more of it should fix it. It's one of the most confidently repeated hangover cures around, passed between generations like genuine folk wisdom. It also happens to be almost entirely backwards.
Where the phrase comes from
The saying originally referred to an old folk remedy for rabies — applying hair from the dog that bit you to the wound, on the logic that like cures like. It got attached to hangovers sometime later, probably because the symmetry was too neat to resist: alcohol made you feel this way, so more alcohol should undo it. It's a tidy story, which is exactly why it's survived so much longer than the evidence behind it.
Why it feels like it works
A hangover involves genuinely uncomfortable withdrawal-like symptoms — shakiness, low mood, anxiety, headache — as your body reacts to falling blood alcohol levels after a night of drinking. Having another drink raises that level back up, and because alcohol has a sedating, anxiety-suppressing effect in the short term, several of those symptoms can genuinely ease within minutes. That real, immediate relief is what convinces people the remedy works. What it doesn't do is address anything that actually caused the hangover in the first place.
What's really happening in your body
While you're topping up your blood alcohol level, your body still has all the same repair work to do — rehydrating, clearing toxic byproducts of alcohol metabolism, replenishing depleted nutrients, and letting inflamed tissues settle. Drinking again doesn't do any of that faster; it simply pauses the withdrawal-like symptoms by delaying the moment your blood alcohol level actually returns to zero. You haven't solved the hangover. You've postponed it and added another dose of alcohol on top.
The delay-and-compound effect
Because the relief is temporary, the original hangover symptoms return once this new drink is also metabolized — often later in the day, and sometimes worse, because there's now more total alcohol for your body to process and clear. For people who reach for hair of the dog regularly, this can quietly turn into a pattern of drinking to manage the previous night's drinking, which is worth noticing in its own right rather than dismissing as just a hangover habit.
Better ways to recover
There's no shortcut that beats time, water, food, and rest. Rehydrating with water or an electrolyte drink, eating something with carbohydrates, and getting sleep will do far more for how you feel by evening than another drink ever could. If hangovers are becoming frequent, or if you notice yourself relying on alcohol just to feel functional the next morning, that's a good moment to talk to a doctor rather than manage it alone.
Sources: US National Institute on Alcohol Abuse and Alcoholism (NIAAA); UK National Health Service (NHS); World Health Organization, alcohol and health resources.
Precise sources and clinical review are pending. Treat health claims as unreviewed and consult a qualified professional for personal guidance.