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why do mountaineers usually suffer from nose bleeding at high altitude

Hi,

Atmospheric pressure decreases with increase in altitude. Therefore, as we go higher the pressure within the blood vessels exceeds the outside pressure. This causes the blood vessels to rupture. As a result, a mountaineer suffer nose bleeding, ear bleeding etc.

Hope, this answer helps you.

Best wishes!! 

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 because they can   not breath properly on high altitude so by the high atmospheric pressure. 

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because the oxygen rate goes on decreasing and the pressure or heat of the body is more than the atmosphere because due to this the mountainers usually suffer from nose bleeding.

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At higher altitudes the air pressure is less. Therefore, breathing is difficult and nose bleeding may occur.
 
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Mountainersat high altitude sometimes experience bleeding through their nose this is because at higher altitudes atmospheric pressure suddenly drops ,this leads to rapture of blood vessels in the body causing bleeding from the nose

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