Headache after alcohol: what to know

A headache after alcohol commonly reflects fluid loss, sleep disruption, stomach irritation, or an alcohol-triggered migraine. Alcohol can also make existing headache patterns more noticeable. The amount and type of drink do not predict the cause by themselves; consider timing, food, fluids, sleep and any nausea, vomiting or sensitivity to light.

Alcohol can increase fluid loss and fragment sleep, both of which can contribute to head pain. It may irritate the stomach, lower blood sugar when meals are skipped, and trigger migraine in some people. Mixing alcohol with other substances or medicines can change the risk. A headache with fever, body aches or respiratory symptoms may have another cause, such as COVID-19, rather than alcohol alone.

Stop drinking alcohol, rest, and sip water or an oral rehydration drink. Eat a simple meal if you can tolerate it. Avoid driving if you feel impaired, dizzy or unusually sleepy. Check the label before taking pain medicine: some products can irritate the stomach or place extra strain on the liver when combined with alcohol. A pharmacist can help you choose safely. Do not use more alcohol as a remedy.

Seek urgent help for inability to wake, slow or irregular breathing, repeated vomiting, seizure, confusion, fainting, severe dehydration, a sudden severe headache, weakness, numbness, stiff neck with fever, or a head injury. Arrange medical advice when headaches follow small amounts of alcohol repeatedly, last longer than expected, or occur with jaundice, severe abdominal pain or ongoing vomiting.

Could alcohol be triggering migraine or interacting with my medicines? How can I replace fluids safely? Which pain medicines should I avoid? What symptoms would mean I need urgent help?