Tibet plateau reaction is not suitable for people with heart disease, bronchial dilatation patients and pregnant women. 1. Heart disease patients: When heart disease patients go to the plateau, due to the thin air and lack of oxygen, it is easy to induce heart disease, mild cases will be chest tightness and discomfort, and serious cases will be life-threatening. 2. Patients with bronchiectasis: the main external symptoms of bronchiectasis are repeated coughing and coughing up sputum, if the condition is more serious, patients may cough up blood and other serious symptoms, therefore, patients with bronchiectasis are not recommended to go to the plateau area, because the plateau area is likely to cause the disease to recur, and even more serious conditions. 3. Pregnant women: Pregnant women are relatively weak and particularly sensitive to the need for oxygen. When pregnant women go to the plateau, they are more prone to plateau reaction and may faint due to lack of oxygen, which may lead to intrauterine oxygen deprivation in the fetus, and in severe cases, adverse pregnancy may occur. Tibet plateau reaction suggests that the above categories of people, try not to go.