What happens to the body envolving biology at High Altitudes

[Iwanttolearn]

Hi I'm new but I'm not sure whether this is the rite site for this kind of question but i have a human movement assessment and i was wondering. When people go to a higher altitude what happens to them i know that they become altitude sick but still does pressure between the bones increase resulting in weaker bones and if I'm mistaken say so and if possible can i get some feedback like some help.

Thanks if you reply to this post