One in five trekkers experiences it to one degree or another. It can even be fatal, yet many trekking companies do nothing to warn their customers about it, so I am happy to write about this very serious subject. Rather than recant lists that you really must read, this article will help you to be more aware of altitude sickness and hopefully motivate you to do your due diligence. I also have a few tips of my own you will want to keep in mind.
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