Question

people often encounter problems like nose bleeding when they reach high altitudes

Answer 1

here is your answer

At high altitudes, there's less oxygen available. This makes the air thinner and drier. The climate inside your nose also gets drier because of this. This makes the blood vessels exposed inside your nose more likely to burst there than at lower altitudes.

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Answer 2

we get nose bleed cause the air makes the hairs present inside our nose dried up and which results in nose bleeding.And in the higher altitude u often get nose bleed cause the less oxygen means less moisture in the air which results in dry air and therefore at high altitude u get up nose bleed.
hope it helped u