Question

why mountaineers often suffer from bleeding of the nose at high altitude .

Answer 1

I don't know it exactly

But let me try

If you go to higher altitudes the pressure increases.. . when the pressure inside your body is lesser than the pressure outside , it starts bleeding

Answer 2

Due to decreasing atmospheric pressure on body . Our heart can pump bood more easily .And nose's smell reseptor made up of blood vessels. That make point to blood spell out easily