In fact, "acclimatization" is due to the changes in living environment such as diet, drinking water, climate and geographical environment, which causes the body to adapt and produces temporary dysfunction syndrome such as biological clock disorder and flora imbalance. There is a great difference in latitude between Chengdu and Qinhuangdao, and the difference between land and sea is getting bigger and bigger. When people feel unwell due to the change of geographical environment, such as loss of appetite, mental fatigue, poor sleep, and even symptoms such as diarrhea and vomiting, palpitation and chest tightness, itchy skin and emaciation, symptoms of "acclimatization" will appear.

When people first arrive in a strange place, they will have allergic symptoms such as insomnia, fatigue, loss of appetite, abdominal distension, diarrhea, vomiting, fever and rash, which is called acclimatization.