Nowadays, many people like to travel to places like Tibet and Yunnan. However, although these places have beautiful scenery, they are all located at relatively high altitudes. This has caused many people to have some altitude sickness. So what effect does high altitude have on the body? In fact, the altitude that the human body can adapt to is usually between 500 and 2500 meters, which is a comfortable altitude. If it exceeds 2500 meters, there will be less oxygen in the air because of the low atmospheric pressure. This will lead to a series of altitude chain reactions such as dyspnea, fatigue, dizziness and dehydration. Therefore, it is suggested that friends who want to visit these high-altitude places must make preparations in advance, such as preparing more oxygen bottles to prevent problems before they happen.