Headache from altitude sickness: what to know

A headache from altitude sickness needs rest, fluids, and stopping further ascent until symptoms settle. It can begin after reaching a higher elevation because the body is adapting to thinner air. Take the symptom seriously, particularly when it comes with nausea, unusual tiredness, dizziness, or reduced coordination.

Altitude sickness, also called acute mountain sickness, commonly causes a headache that may feel throbbing, pressure-like, or worse with activity. The change in oxygen availability is the main trigger; dehydration, exertion, alcohol, and poor sleep can add to the strain. Headache alone does not establish the diagnosis, so note when it started, the altitude reached, and any accompanying symptoms.

Stop climbing and rest at the same altitude. Sip water or an oral rehydration drink, eat if you can, and avoid alcohol and strenuous activity. Do not continue upward while symptoms are present. A clinician or travel-health professional can advise whether a suitable pain reliever or altitude medicine is appropriate for you; do not use someone else’s prescription.

Get urgent medical help if the headache is severe or worsening, or if there is confusion, difficulty walking, fainting, breathlessness at rest, a persistent cough, blue lips, or repeated vomiting. Descent to a lower altitude may be lifesaving when serious altitude illness is suspected, and should not be delayed while waiting for a tablet to work.

Ask whether your symptoms fit altitude sickness, whether you should descend, which medicines are safe with your health conditions, and how to plan a slower ascent for future travel.