Feeling chest tightness all the time may be mainly due to the following reasons: 1. Inadequate blood supply to the heart, especially in patients with previous hypertension, hyperlipidemia, diabetes, unexplained chest tightness, should be alert to coronary heart disease insufficient blood supply, do electrocardiogram and cardiac ultrasound for diagnosis. 2. Heart failure, especially in patients with previous underlying heart disease, such as cardiomyopathy, heart valve disease, coronary heart disease, etc. The presence of activity-related dyspnea should be noted as cardiac insufficiency, and cardiac ultrasound and BNP should be improved for clarification. 3. Pulmonary diseases, such as chronic obstructive pulmonary disease and bronchial asthma, can also present symptoms of chest tightness, but this disease is a chronic disease, and it has often recurred before, and examination of chest CT and pulmonary function can help clarify the diagnosis. 4. Psychological factors, such patients have chest tightness This kind of patients have symptoms of chest tightness, but the routine examination are normal, do psychological relief can help to improve.