Headache after drinking alcohol: what to know

Alcohol can increase fluid loss and fragment sleep, both of which can make the head feel sore or heavy the next day. It may also widen blood vessels and irritate the stomach, while congeners in some drinks can add to symptoms. A headache can occur with nausea, thirst, light sensitivity, fatigue, or dizziness. The pattern matters: note the drink, amount, timing, food, sleep, and any flushing or wheeze. Repeated symptoms may point to sensitivity rather than a simple hangover. Dehydration can contribute to headache and is worth reading about if thirst, dark urine, or weakness accompany it.

Rest somewhere quiet, sip water or an oral rehydration drink, and eat a light meal if you can tolerate it. Avoid more alcohol. Do not drive if you remain dizzy, drowsy, or unsteady. Use a pain medicine only if it is safe for you; alcohol and some medicines can irritate the stomach or affect the liver, so check the label or ask a pharmacist. Keep a brief record when episodes recur, including the beverage and associated symptoms.

Seek emergency help for a sudden severe headache, confusion, fainting, seizure, trouble breathing, repeated vomiting, weakness on one side, difficulty speaking, or a head injury. Get medical advice when headaches keep returning after small amounts, last longer than expected, or occur with fever, stiff neck, vision change, or chest symptoms. A clinician can assess other causes such as infection, heat exhaustion, or an allergic reaction.

Ask whether the timing suggests alcohol sensitivity, dehydration, migraine, or another cause; whether any of your medicines should not be combined with alcohol; and which warning signs should prompt urgent assessment.