Drinking another beer doesn’t cure a hangover. It postpones it. The “hair of the dog” strategy masks your symptoms temporarily by putting alcohol back into a system that’s struggling to clear it, but the hangover returns once that drink wears off, often worse than before. As Laura Veach, a researcher at Wake Forest Baptist Medical Center, put it: “It doesn’t cure the hangover; it just sort of tricks you by masking the symptoms. They’re going to show up eventually.”
Why It Feels Like It Works
There’s a real biological reason a morning beer seems to help. A hangover is essentially a state of nervous system hyperexcitability. While you’re drinking, alcohol enhances the activity of your brain’s main calming chemical and suppresses the main excitatory one. Your brain adapts to this by dialing down its calm-down signals and ramping up the excitatory ones to compensate. When the alcohol leaves your system, you’re left with a nervous system stuck in overdrive. That’s what causes the tremors, sweating, racing heart, light sensitivity, and general misery of a hangover.
Drinking another beer temporarily reverses that overdrive state by flooding the system with a sedative (alcohol) again. You feel relief because you’ve quieted the rebound excitation. But you haven’t resolved it. You’ve just delayed it while adding more alcohol for your liver to process.
The Methanol Theory
There’s a second, more specific mechanism that gets cited in favor of hair of the dog. Many alcoholic drinks contain small amounts of methanol alongside the ethanol you’re actually drinking. Your body breaks methanol down into formaldehyde and then into formic acid, both of which are toxic. Ethanol has a stronger claim on the same liver enzymes that process methanol, so while you’re actively drinking, methanol sits waiting in line. Once the ethanol clears, the methanol gets processed, and some researchers believe this contributes to hangover symptoms.
Drinking another beer would, in theory, push methanol back to the end of the line again. This is actually the basis for how hospitals treat methanol poisoning: they administer ethanol (or a pharmaceutical equivalent) to competitively block methanol from being converted into its toxic byproducts. But in a normal hangover, the amount of methanol involved is tiny compared to a poisoning scenario. You’re not treating a medical emergency. You’re just delaying a small part of the overall hangover process while creating new toxins for your liver to handle.
What Actually Happens to Your Body
When you drink a morning beer during a hangover, several things work against you simultaneously. Your liver is already backed up processing the acetaldehyde (a toxic intermediate) left over from last night’s drinking. Adding more alcohol means more acetaldehyde production on top of what’s already there. Your body has to start from scratch metabolizing a fresh dose of alcohol before it can finish recovering from the original one. The total recovery timeline stretches longer.
Alcohol also acts as a diuretic, meaning it makes you urinate more than the volume of liquid you took in. Early research estimated roughly an extra 100 mL of urine for every 10 grams of alcohol consumed. A standard beer contains about 14 grams of alcohol. So you’re actually deepening the dehydration that’s already contributing to your headache and fatigue, even though it feels like you’re “hydrating” with a cold drink.
Meanwhile, the inflammatory response triggered by last night’s drinking is still running. Alcohol promotes the release of immune signaling molecules that cause the aches, nausea, and brain fog you associate with a hangover. Another beer doesn’t shut that process down. It feeds it more raw material.
The Dependency Concern
Beyond the immediate biology, there’s a behavioral pattern worth understanding. Addiction researchers describe “hair of the dog” drinking as a textbook example of negative reinforcement: you feel bad, you drink, you feel temporarily better, and your brain learns that alcohol is the solution to alcohol’s own consequences. This cycle, using a drug to relieve the aversive effects of that same drug, is a well-documented pathway toward escalating use and eventual dependence.
This doesn’t mean that one morning beer will make you an alcoholic. But regularly reaching for a drink to manage hangover symptoms is a pattern that correlates with higher risk for alcohol use disorder. If you find yourself frequently needing a drink to feel normal the morning after, that’s a signal worth paying attention to.
What Actually Helps a Hangover
Since a hangover involves multiple overlapping problems (dehydration, inflammation, nervous system rebound, and residual toxin processing), no single remedy knocks it out completely. But several approaches address the actual underlying causes rather than masking them.
- Water and electrolytes. Rehydrating is the single most impactful thing you can do. Plain water helps, but adding electrolytes (through sports drinks, broth, or oral rehydration solutions) replaces the sodium and potassium lost through alcohol’s diuretic effect.
- Anti-inflammatory pain relievers. Ibuprofen can help with headaches and body aches driven by the inflammatory response. Avoid acetaminophen (Tylenol) during a hangover, since your liver is already under strain from processing alcohol.
- Food. Eating helps stabilize blood sugar, which alcohol depletes. Bland, easy-to-digest foods are best if nausea is an issue.
- Sleep. Alcohol disrupts sleep architecture, meaning even if you were in bed for eight hours, the quality was poor. Additional rest lets your nervous system recalibrate.
- Time. Most hangover symptoms resolve within 24 hours as your body finishes clearing acetaldehyde and your nervous system returns to baseline. Nothing truly speeds this up, but the approaches above make the wait more bearable.
The honest answer is that the only guaranteed way to prevent a hangover is to drink less in the first place. Once you’re already in one, your body needs time, fluids, and rest to do its job. Another beer just moves the finish line further away.