The greatest threat to safe Tibet is usually altitude sickness, and altitude sickness is actually a process in which humans' own functions adapt to high altitude oxygen deficiency. For most people, this process should not be a problem if measures are taken properly. In general, healthy tourists traveled to Lhasa and there was no reaction at that time. The usual altitude sickness hits 6-10 hours after reaching the plateau. So if you go to Lhasa immediately and start walking, the price you pay will be very uncomfortable at night and in the days ahead. Therefore, the most necessary thing to do is to force yourself to stay in bed immediately on the day you arrive in Lhasa. The usual situation is that tourists may have very slight symptoms such as rapid heartbeat and headaches on the night of their arrival. However, if you immediately maintain an absolute rest, these feelings will disappear after 24 hours. It should be noted that if you are catching a cold, it is best not to rush to the plateau. Medical experts in Tibet have warned tourists not to believe that it is easier for the Qinghai-Tibet line to adapt to altitude sickness than to fly to Tibet, especially when you are on the plateau for the first time. Although it is relatively easy to gradually adapt to the plateau in theory, it is a case of taking a hiking or the like and raising it no more than 300 meters per day. Now, the cars that take the Qinghai-Tibet line mostly arrive in Lhasa within 30 hours, and they also have to cross the Tanggula Mountain Pass at an altitude of 5,231 meters. The danger is actually more than flying into Tibet by plane. What's more, it is a difficult and lengthy route. The geography along the way, the climate and other conditions are more complicated, and the shuttle buses often stay open day and night. Moreover, traveling on the Qinghai-Tibet line does not have good medical conditions. It is more prudent to say that it was not as safe as taking a plane on the Qinghai-Tibet line for the first time on the plateau, especially for those tourists whose body is not usually very good. If you really want to take a look at the scenery on the Qinghai-Tibet line, it's best to choose the way back to the mainland, because then you have basically adapted to the conditions of the plateau. The altitude response varies from person to person and it is difficult to predict before going to the plateau. Each person's response manifests in different ways. Generally, thin people are better than fat people. Women are better than men. Short people are better than tall people. Young people are better than old people. However, the medical technology for the treatment of mountain sickness in Tibet has reached the world's leading position. There is already a set of effective treatment methods for the treatment of alpine diseases, from taking oxygen medicine to doing the most complicated cardiac catheter surgery. Full. Especially in the Second Division of the People's Hospital of Lhasa (Alpine Disease Institute of Cardiovascular Diseases), the level is relatively high. Many doctors point out that the most important thing in preventing altitude sickness is not to carry psychological burdens on the plateau. Many people have a strong fear of altitude sickness, and some media propaganda has deepened this illusion. In fact, the response of over 99% of Tibetan travelers will not cause mountain sickness that needs treatment.