What causes high altitude or mountain sickness?
Lack of oxygen causes high altitude sickness. As altitude increases, the air becomes “thinner,” which means less oxygen is in the atmosphere. You take in less oxygen to your lungs with each breath, so the amount of oxygen in your blood declines (this is called hypoxia). Anyone can experience mountain sickness, but it may be more severe in people who have heart or lung problems.

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1. What is high altitude or mountain sickness?
2. What causes high altitude or mountain sickness?
3. What are the symptoms of high altitude or mountain sickness?