There are two reasons for the tightness of breath, i.e. chest tightness and shortness of breath, one is physiological reasons such as mental tension and being in a closed environment; the other is pathological reasons such as chronic obstructive pulmonary disease (COPD) and coronary heart disease (CHD). 1. Physiological causes: when the patient’s spirit is too tense, too much pressure, and there are depression and anxiety, he or she will often feel tightness in the chest and shortness of breath; the patient will also experience this symptom if he or she is in a closed environment for a long period of time. 2. Pathological causes: respiratory diseases such as tracheal stenosis, tracheal tumors, bronchial asthma, chronic obstructive pulmonary disease will cause shortness of breath; cardiovascular diseases such as coronary heart disease, congenital heart disease, cardiovascular diseases such as valvular heart disease will also cause shortness of breath. When patients repeatedly appear chest tightness and shortness of breath and other symptoms, it is recommended that patients promptly to the hospital, follow the doctor’s instructions to carry out relevant examinations to clarify the diagnosis and actively carry out treatment.