Question

why some people experience nosebleeds when they go to higher attitude?

Answer 1

High altitude - as altitude increases, the availability of oxygen decreases, making the air thinner and drier. The dryness can cause the nose to bleed
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Answer 2

AT HIGHER ALTITUDES ,SINCE THE ATMOSPHERIC PRESSURE IS LESS BECAUSE OF WHICH BREATHING BECOMES DIFFICULT AND NOSE BLEEDING MAY OCCUR DUE TO EXCESS OF PRESSURE OF BLOOD OVER THE ATMOSPHERIC PRESSURE. THEREFORE MOSTLY THE BLOOD PRESSURE PATIENT ARE NOT ADVISED TO GO AT HILL STATION OR AT HIGHER ALTITUDES