Many people think only when they climb the mountain or do another things,they can meet hypoxia,but the fact is not that,sometims when you don't do anything,you can also....

If you want to know more details about the hypoxia,you can have a quantum magnetic analyzer for test ,as it can show clearly that to you.
In the range of 33.642-141.476, it shows the oxygen content of the body's cells is normal. The abnormality shows the oxygen content of the cells is low, the respiratory system is possible abnormal, and there is an anemia trend and lack of exercise. It can result in cell degeneration, memory loss and indigestion.

Standard: - Normal    + Mildly Abnormal    ++ Moderately Abnormal    +++ Severely Abnormal
Hypoxia: 133.642-141.476(-) 126.619-133.642(+) 123.321-126.619(++) <123.321(+++)