Chest tightness is a subjective feeling that breathing is laborious or there is not enough air. In mild cases, it is as if nothing has happened, but in severe cases, it feels unbearable, as if a stone is pressed against the chest, and even dyspnea occurs. It may be a functional manifestation of a body organ or one of the earliest symptoms of a disease occurring in the body. Chest tightness dyspnea, chest tightness in people of different ages, its cause is not the same, the treatment is not the same, the consequences are not the same. First, functional chest tightness (i.e., no organic lesions of chest tightness): in the doors and windows closed, air circulation is not in the room to stay for a long time, or encountered some unpleasant things, or even with other people have a verbal dispute, argument, or in the climate of low air pressure, often produce chest tightness, fatigue feeling. After a short period of rest, open the window to ventilate or go outdoors to breathe fresh air, relaxation of the mind, regulate the mood, will soon be able to return to normal. Like this type of chest tightness can be said to be functional chest tightness, do not have to be nervous, do not have to treat. Second, pathological chest tightness (i.e., organic lesions of chest tightness): chest tightness can not only be physiological, but also due to some organs in the body caused by disease, i.e., pathological chest tightness. Such as: 1. Respiratory tract obstruction: tracheobronchial growth of tumors, tracheal stenosis, tracheal external pressure (goiter, mediastinal growth of tumors); 2. Lung disease: emphysema, bronchitis, asthma, pulmonary atelectasis, pulmonary infarction, pneumothorax; 3. Heart disease: certain congenital heart disease rheumatic heart valve disease, coronary artery disease, cardiac tumors; 4. Diaphragm disease: diaphragm bulge, diaphragmatic paralysis; 5. Disorders of fluid metabolism and acid-base balance, etc.