Question

As mountaineers climb higher ,they sometimes get nosebleeds why

Answer 1

because of pressure at high altitude.

Answer 2

Hey.....

Here is your answer
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If we climb in the mountains , then due to the high pressure of the top of the mountain , we feel uncomfortable due to low amount of oxygen and sometimes it also results in nose bleeding...

I hope it helps you dear.

Regards,
Keshaw.......