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Because of asthmatic Allergies. Or you smoke too much?

The physical difficulty is because there is lower pressure outside. When you're going from a higher pressure/lower altitude area, your body is going to be accustomed to 1 atmosphere or so of pressure,

but when that pressure decreases, your inner workings will push outward. (This is why your ears pop.) Your abdomen pushes outward, which makes the diaphragm, which controls your lung volume, harder to contract. And so it is physically harder to breathe, because the diaphragm has to push down into your abdominal area more to make more room in your thoracic cavity to inflate your lungs. After a few hours, the pressures will normalize. (This is one of the reasons why astronauts have to camp out in the airlock for several hours before and after spacewalks, the other isdecompression sickness).

Once you get past the physical difficulty, there's the risk of suffocation even while breathing "normally." At higher altitudes, there is lower atmospheric pressure. As a result, the oxygen gas is at lower pressure. Your lung efficiency depends on thepartial pressure of oxygen available and carbon dioxide inside the lungs, and lower oxygen pressures mean the concentration of oxygen available for hemoglobin to pick up is less, and it does so less efficiently. And if you can't get oxygen to where your body needs it, you will suffocate, even if you are breathing normally.

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14y ago

What else can I help you with?