What is Atmospheric Pressure?
The bleeding of the nose and ears is very common among people moving up to higher altitudes and hilly areas most of the time. This happens due to the 'atmospheric pressure' decreasing on the way up and the internal pressure increasing, causing the blood vessels to rupture and bleed.
The 'atmospheric pressure' is also known as the 'barometric pressure', simply the pressure created within the Earth's atmosphere. It is created because all the air around us has a certain weight, and it exerts pressure on the surface as it gets pulled by Gravity towards the Earth.