MH.Yang
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I don't know the reason. But residents of low altitude areas who go to live in Tibet for long periods of time are prone to diseases such as emphysema or heart perforation. This is one of the main reasons why the population of Tibet is getting smaller and smaller. Tibetan residents like to migrate to the eastern provinces, while it is difficult for residents of other provinces to migrate to Tibet.Why would you get heart and lung disease at altitude ???