FeaturedAltitude sickness is the most predictable serious risk on a Himalayan trek, and the most preventable. It does not care how fit you are, and it is not a sign of weakness. It is what happens when the body climbs faster than it can adapt to thinner air. Every year Indian trekkers on popular routes, and tourists who fly straight into Leh, get into trouble that a little knowledge would have avoided. This guide explains what to watch for and what to do.
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