The question of whether altitude sickness is delayed or not cannot be generalized, as the tolerance ability of patients to air pressure varies from one physique to another. Under normal circumstances, when patients enter the plateau, there will be different degrees of plateau pulmonary edema and plateau cerebral edema, patients will have chest tightness, palpitations, shortness of breath, accompanied by coughing, coughing and other conditions, in addition there will be dizziness, syncope, transient unconsciousness and other conditions. For some people with poor basic constitution, the plateau reaction will appear especially early and the symptoms will be especially obvious. However, for those who have been trained to be physically fit, a mild attack will usually occur after 48h or even 72h.