If the patient feels chest tightness recently, the following points should be considered: First, the patient is considered to have primary cardiac diseases, such as coronary angina pectoris, myocarditis, pericarditis, valvular disease of the heart, rheumatic heart disease, hypertensive heart disease, which will lead to ischemia and lack of oxygen in the cardiac myocytes of the patient, resulting in chest tightness, shortness of breath, palpitations of the clinical symptoms and manifestations. Second, for respiratory diseases, especially in the respiratory system of chronic diseases, often in chronic obstructive pulmonary emphysema, chronic pulmonary heart disease, pulmonary arterial hypertension, at this time, because of the decline in blood oxygen saturation, partial pressure of oxygen is too low and lead to chest tightness, shortness of breath clinical symptoms. Third, for endocrine diseases, such as thyroid dysfunction, adrenal dysfunction, there will also be patients with chest tightness. Fourth, if the patient has vegetative nerve dysfunction, causing cardiac neurosis, will also often feel chest tightness.