When to worry about nausea with altitude sickness

Nausea is a very common presentation of Altitude Sickness. It may occur with headache, dizziness, tiredness, reduced appetite, or disturbed sleep after going higher. Mild symptoms can worsen if a person continues to ascend or remains at the same height.

Severe headache, confusion, unusual sleepiness, difficulty walking straight, or breathlessness while resting can indicate a more serious altitude illness. These signs require action rather than observation alone.

Stop ascending, rest, stay with another person, and take small sips of fluid if you can keep them down. Do not use alcohol or sedating medicines. If symptoms do not improve or are getting worse, move to a lower altitude with help; avoid travelling alone.

Use prescribed altitude medication only as directed. Oxygen may be needed in an emergency, but it should not delay descent or medical help. More information is available on [Nausea](/symptoms/nausea/).

Treat confusion, fainting, inability to walk normally, blue lips, severe breathlessness at rest, chest tightness, or coughing frothy sputum as an emergency. Arrange urgent assessment for repeated vomiting, inability to drink, worsening headache, or symptoms that continue after descent.

Ask a clinician how quickly to ascend, whether you need preventive medicine, and what descent plan suits your trip. Discuss previous altitude symptoms, heart or lung conditions, pregnancy, and medicines before travelling.