A hangover headache typically lasts anywhere from a few hours to a full day, though it can persist for up to 72 hours after drinking in more severe cases. Most people find the headache peaks in the morning after a night of drinking and fades by late afternoon or evening. How long yours sticks around depends on how much you drank, what you drank, how hydrated you were, and your individual biology.
Why Alcohol Causes a Headache
Your hangover headache isn’t caused by alcohol itself, which has already left your system by the time the headache is at its worst. Instead, it’s the aftermath of what alcohol did while it was in your body. Alcohol suppresses the hormone that tells your kidneys to hold onto water, so you urinate far more than usual. The resulting dehydration, along with the loss of sodium and potassium, causes your brain’s surrounding fluid levels to drop. This creates a headache similar to what you’d feel from low spinal fluid pressure.
At the same time, alcohol triggers an inflammatory cascade. Your body ramps up production of prostaglandins and other inflammatory signaling molecules, which cause blood vessels inside and around your brain to dilate. That widening of blood vessels is what produces the throbbing, pulsing quality of a hangover headache. Neurotransmitters like histamine and serotonin also get disrupted, which is why hangover headaches often feel similar to migraines in people who are prone to them.
What Makes Some Hangovers Last Longer
The type of alcohol you drink plays a surprisingly large role. Darker drinks like red wine, brandy, and whiskey contain higher levels of congeners, particularly methanol. Methanol is a byproduct of fermentation, and your liver can’t even begin breaking it down until it finishes processing the ethanol (the main alcohol). Once it does, methanol converts into formaldehyde and formic acid, both of which are toxic and contribute to headache severity. This delayed processing is one reason hangover symptoms don’t start until hours after your last drink, and why congener-heavy drinks tend to produce longer, more intense headaches. Beer and vodka sit at the opposite end of the spectrum, with the lowest methanol levels.
Beyond drink choice, the total amount of alcohol matters most. More alcohol means more dehydration, more inflammation, and a longer recovery window. Drinking on an empty stomach accelerates absorption and worsens the eventual hangover. Poor sleep quality (alcohol disrupts deep sleep even if you pass out quickly) also makes the headache feel worse and last longer because your body has less opportunity to repair the damage overnight.
A Typical Timeline
Hangover headaches follow a fairly predictable arc. Symptoms generally begin once your blood alcohol level drops back toward zero, which for most people means early morning or upon waking. The headache tends to peak within the first few hours after you wake up, then gradually subsides over the course of the day. For a moderate night of drinking, most people feel significantly better by the afternoon.
Heavier drinking sessions push the timeline further. A headache that lingers into the second day isn’t unusual after a night of binge drinking. In extreme cases, the full range of hangover symptoms, headache included, can take up to 72 hours to fully resolve. During this time, your reaction time, memory, and coordination remain impaired even though alcohol itself is no longer in your bloodstream.
What Helps (and What Doesn’t)
Rehydration is the most effective first step. Water helps, but drinks containing sodium and potassium (like sports drinks or oral rehydration solutions) restore fluid balance faster because they replace the electrolytes lost through excessive urination. Sipping these before bed and again in the morning can noticeably shorten the headache window.
Over-the-counter pain relievers like ibuprofen can take the edge off a hangover headache, but they come with a tradeoff: both ibuprofen and aspirin irritate the stomach lining, which alcohol has already inflamed. Acetaminophen is a worse option. The combination of acetaminophen and recent alcohol use can cause serious liver damage, since both substances compete for the same detoxification pathway in your liver.
Coffee is a popular hangover remedy, but it may actually backfire for headaches specifically. Caffeine constricts blood vessels and raises blood pressure, which can intensify the pounding sensation rather than relieve it. If you’re a daily coffee drinker and skipping it would give you a caffeine withdrawal headache on top of everything else, a small cup is reasonable. But drinking extra coffee as a hangover cure is likely to make your head feel worse.
Eating a meal helps stabilize blood sugar, which drops during heavy drinking and contributes to the overall misery. Simple carbohydrates and bland foods are easiest on an irritated stomach. Rest and time remain the most reliable cure. Your body needs to clear the inflammatory byproducts, restore fluid balance, and return neurotransmitter levels to normal, and none of that can be meaningfully rushed.
When It Might Not Be a Hangover
A headache that arrives the morning after drinking is almost always a standard hangover. But if you drink heavily and regularly, a headache that starts 6 to 12 hours after your last drink could be an early sign of alcohol withdrawal rather than a simple hangover. Withdrawal headaches come with escalating symptoms: anxiety, tremors, excessive sweating, and insomnia that intensifies over the next 24 to 48 hours rather than improving. Hangover headaches get better as the day goes on. Withdrawal symptoms get worse. If you notice a pattern of increasingly severe symptoms each time you stop drinking, that distinction matters and is worth discussing with a doctor.