Question

why do some people experience nasal bleeding at high altitude

Answer 1

in high altitude blood pressure of body increases therefore as a result blood starts to flow out from our body and among it nose is the major place from where blood leaves out.therefore some people experience nasal bleeding

Answer 2

Because at high altitudes, the partial pressure of oxygen is less than that at ground level. This leads to low concentration of oxygen in the blood and tissues. It also causes dryness in nose which causes nasal bleeding.