Hangover Headache: Why It Happens and How to Get Relief Safely

A hangover headache is thought to come from a mix of inflammation, blood-vessel changes, poor sleep and mild dehydration, and time is the only sure fix, though rest, food, water and a carefully chosen pain reliever can take the edge off.1,2 If you use a pain reliever, an NSAID such as ibuprofen, taken with food, is generally preferable to acetaminophen for healthy adults after drinking, because acetaminophen combined with alcohol can harm the liver.1,21 NSAIDs carry their own stomach-bleeding risk with alcohol, so follow the label and ask a pharmacist if you're unsure.10

Key takeaways

  • The international headache classification says the delayed alcohol headache, formerly called "hangover headache," develops 5 to 12 hours after drinking and resolves within 72 hours.4
  • In a Japanese placebo-controlled trial of 150 people with hangovers, the NSAID loxoprofen relieved headache but not fatigue or nausea.3
  • Acetaminophen and aspirin haven't been tested against placebo for hangover, and NIAAA warns that acetaminophen plus alcohol can be toxic to the liver.5,1
  • Caffeine withdrawal caused headache in about half of people in experiments, so skipping your usual coffee can add to a hangover headache.6
  • A 2023 lab study proposed that a red wine compound, quercetin glucuronide, triggers headaches by blocking the enzyme that clears acetaldehyde; it hasn't been tested in people.7

Why does drinking give you a headache?

Several things at once. The international headache classification calls it "delayed alcohol-induced headache," one of the commonest secondary headaches: it starts within 5 to 12 hours of drinking, resolves within 72 hours, and has at least one of three features: it's on both sides, it throbs, or physical activity makes it worse.4

  • Inflammation. Immune markers such as IL-6, TNF-α and CRP correlate with hangover severity.2
  • Mild dehydration. Alcohol increases urine output, and NIAAA says the resulting mild dehydration likely contributes to headache.1
  • Poor sleep. Alcohol fragments the second half of the night and reduces REM sleep.8
  • Blood vessels. Alcohol's vessel-widening effects are one proposed mechanism; the ICHD-3 calls the headache's mechanism unresolved.9,4

The deeper science is in what causes a hangover, and the full symptom picture in hangover symptoms.

Which pain relievers are safest after drinking?

For most healthy adults, an NSAID taken with food is generally preferable to acetaminophen after drinking; Cleveland Clinic advises avoiding acetaminophen and using NSAIDs sparingly, because they can upset the digestive system.21 Neither option is risk-free, neither has strong hangover evidence, and NSAIDs aren't right for everyone.3,10

Pain relief for a hangover headache: evidence and alcohol-related risks (as of October 2026)
Option Hangover evidence Alcohol-related risk Practical notes
NSAIDs (ibuprofen, naproxen, aspirin) One Japanese trial: the NSAID loxoprofen eased hangover headache, not fatigue or nausea.3 Aspirin hasn't been tested against placebo.5 Stomach irritation and bleeding; a heavy night can inflame the stomach lining, and NSAIDs may aggravate it10,11 Take with food or milk. Ask a doctor or pharmacist first if you've had ulcers or stomach bleeding, have kidney or heart disease or high blood pressure, or take blood thinners10,12
Acetaminophen (Tylenol) Not tested against placebo for hangover5 Can be toxic to the liver with alcohol1,10 Avoid while alcohol is in your system or after heavy drinking. Check cold and flu products for hidden acetaminophen10

NIAAA notes that some people take acetaminophen before bed after drinking, exactly the combination to avoid.1 Follow the label; our guide to pain relievers and alcohol goes deeper.

Non-drug relief: water, food, caffeine, a cool cloth and a dark room

These won't cure a hangover headache, but they're low-risk.

  • Water, especially if you've vomited.13 It helps thirst, though it hasn't been shown to change overall hangover severity.14
  • Food. Something bland, which also helps prevent stomach upset if you take ibuprofen.12
  • Caffeine. Your usual amount prevents a withdrawal headache; extra adds jitters and a faster heart rate.6,15
  • A cool cloth and a dark room. MedlinePlus suggests resting in a quiet, dark room with a cool cloth on your head.13 Light and sound sensitivity are classic hangover symptoms.1
  • Skip the hard workout. The delayed alcohol headache is often worse with physical activity.4

Red wine headaches and the quercetin hypothesis

Some people get headaches from red wine but not other drinks, and the cause isn't known. In 2023 lab tests, quercetin-3-glucuronide, a form of quercetin that circulates after drinking red wine, inhibited ALDH2, the enzyme that clears acetaldehyde. Red wine has far more quercetin than white wine.7

The hypothesis is that acetaldehyde then builds up and triggers headaches in susceptible people. The authors say human testing is needed; as of October 2026 we found none published. Sulfites are another suspect for sensitive people.1 More in wine hangovers.

Migraine vs. hangover headache

A hangover headache follows drinking by hours and fades within about three days; migraine is its own condition that alcohol can trigger.4 About a third of people with migraine report alcohol as an occasional trigger, but only about 10% as a frequent one, and studies disagree on whether red wine is worse than white.9 If you have migraine, ask your doctor whether your medicine is safe with alcohol still in your system.

When is a headache after drinking an emergency?

Get emergency care (call 911 or go to the ER) if a headache after drinking:

  • comes on suddenly and is explosive, or is the worst you've ever had;
  • comes with slurred speech, a change in vision, or trouble moving your arms or legs;
  • comes with fever, a stiff neck, nausea and vomiting;13
  • follows a fall or blow to the head and keeps getting worse, or comes with repeated vomiting or one pupil larger than the other.16

Confusion, seizures or trouble staying awake can mean alcohol poisoning; see the box below. And a headache with shakiness, sweating and anxiety after a run of heavy drinking can be withdrawal.17 See hangover or something else?

How do you prevent the next one?

Drink less: the total amount matters most, and US guidance says to "consume less alcohol for better overall health"; pregnant women, people in recovery or unable to control their drinking, and people on interacting medicines shouldn't drink at all.1,18 Pace yourself, eat beforehand, keep your usual coffee, and don't pre-load with acetaminophen at bedtime. Don't drive while hungover: attention and coordination stay impaired even at zero blood alcohol.1 If hangover headaches are a weekly event, mention it to your doctor. See how to cure a hangover.

What we don't know yet

The best pain-reliever data come from one Japanese loxoprofen trial; acetaminophen and aspirin remain untested against placebo.3,5 The red wine hypothesis is untested in people, and the headache's mechanism is unresolved.7,4

Frequently asked questions

Is ibuprofen or Tylenol better for a hangover headache?

For most healthy adults after drinking, ibuprofen taken with food is generally preferable to acetaminophen (Tylenol), because acetaminophen plus alcohol can be toxic to the liver.1,21 But NSAIDs plus alcohol raise stomach-bleeding risk, so ask a pharmacist or doctor first if your stomach is upset, you've had ulcers, you have kidney or heart disease or high blood pressure, or you take blood thinners.10,12 Follow the label.

Why does red wine give me a headache?

Nobody knows for sure. A 2023 lab study proposed that a quercetin compound from red wine blocks the enzyme that clears acetaldehyde, but that hasn't been tested in people.7 Sulfites can also cause headaches in sensitive people.1

Does caffeine help a hangover headache?

If you drink coffee daily, your usual amount prevents a caffeine-withdrawal headache, which affected about half of people in experiments.6 It doesn't cure a hangover, and extra caffeine can add jitters and a faster heart rate.1,15

How long does a hangover headache last?

By the international definition, it develops within 5 to 12 hours of drinking and resolves within 72 hours.4 Hangover symptoms usually ease within a day.21 A headache that lasts longer or keeps getting worse needs a medical check.13

When should I worry about a headache after drinking?

Call 911 for a headache that comes on suddenly and explosively or is the worst you've ever had, or one that comes with slurred speech, vision changes, trouble moving your arms or legs, or fever with a stiff neck.13 A headache that keeps getting worse after a fall or blow to the head, or comes with repeated vomiting or one pupil larger than the other, also needs emergency care.16

Sources

  1. National Institute on Alcohol Abuse and Alcoholism (NIAAA). Hangovers. Updated December 2025. NIAAA
  2. van de Loo AJAE, et al. The inflammatory response to alcohol consumption and its role in the pathology of alcohol hangover. J Clin Med. 2020;9(7):2081. PubMed
  3. Hara M, et al. A nationwide randomized, double-blind, placebo-controlled physicians' trial of loxoprofen for the treatment of fatigue, headache, and nausea after hangovers. Alcohol. 2020;84:21-25. PubMed
  4. Headache Classification Committee of the International Headache Society. International Classification of Headache Disorders, 3rd edition (ICHD-3): 8.1.4.2 Delayed alcohol-induced headache. ICHD-3
  5. King's College London. No convincing scientific evidence that hangover cures work. News release, January 5, 2022. KCL
  6. Juliano LM, Griffiths RR. A critical review of caffeine withdrawal: empirical validation of symptoms and signs, incidence, severity, and associated features. Psychopharmacology (Berl). 2004;176(1):1-29. PubMed
  7. Devi A, et al. Inhibition of ALDH2 by quercetin glucuronide suggests a new hypothesis to explain red wine headaches. Sci Rep. 2023;13(1):19503. PubMed
  8. Ebrahim IO, et al. Alcohol and sleep I: effects on normal sleep. Alcohol Clin Exp Res. 2013;37(4):539-549. PubMed
  9. Panconesi A. Alcohol and migraine: trigger factor, consumption, mechanisms. A review. J Headache Pain. 2008;9(1):19-27. PubMed
  10. FDA. 21 CFR 201.326: required warnings for over-the-counter pain relievers. eCFR
  11. Bode C, Bode JC. Alcohol's role in gastrointestinal tract disorders. Alcohol Health Res World. 1997;21(1):76-83. PubMed
  12. MedlinePlus (NIH). Ibuprofen. MedlinePlus
  13. MedlinePlus (NIH). Headaches. Reviewed October 27, 2025. MedlinePlus
  14. Mackus M, et al. Alcohol hangover versus dehydration revisited: the effect of drinking water to prevent or alleviate the alcohol hangover. Alcohol. 2024;121:9-18. PubMed
  15. FDA. Spilling the Beans: How Much Caffeine Is Too Much? August 2024. FDA
  16. CDC. HEADS UP: Signs and Symptoms of Concussion. September 2025. CDC
  17. MedlinePlus (NIH). Alcohol withdrawal. Reviewed January 1, 2025. MedlinePlus
  18. USDA and HHS. Dietary Guidelines for Americans, 2025–2030. January 2026. PDF
  19. NIAAA. Understanding the Dangers of Alcohol Overdose. Updated December 2025. NIAAA
  20. SAMHSA. National Helpline. SAMHSA
  21. Cleveland Clinic. Hangover. Last updated April 6, 2026. Cleveland Clinic

Published by Fuller Health, which makes After Party. This article is general information, not medical advice: talk to a doctor or pharmacist about your own health, medicines and drinking. Last reviewed October 9, 2026. How we research and write.

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