After people enter the plateau will appear plateau reaction, plateau reaction is more powerful people have the following kinds of: 1, older and have chronic diseases: this kind of people because of poor physical quality, and have heart disease and other chronic diseases will lead to the degree of plateau reaction is more serious, because the plateau reaction mainly leads to the human body lack of oxygen, and people with heart disease itself blood circulation, oxygen transport capacity is relatively poor In addition, coupled with the low oxygen content of the plateau zone, the whole body will be aggravated by the symptoms of hypoxia will appear serious plateau reaction; 2, pregnant women and children: these people are also relatively weak, especially pregnant women during pregnancy, the body needs more oxygen, after entering the plateau zone due to low oxygen content will aggravate the plateau reaction. Children are weaker and have poorer resistance, and their tolerance to oxygen is also poorer, so they will have more serious plateau reactions.