When the left lung is completely removed, only the contralateral right lung will be left, and lung function will be reduced by at least half of what it was when both lungs were present. The patient’s respiratory function will be limited to varying degrees, both the ventilation function of the lungs and the gas exchange function are reduced. Symptoms of respiratory distress such as wheezing, shortness of breath, chest tightness, and shortness of breath may occur at any time, especially when agitated by activities or stimulated by mental stress, which may accelerate the respiration and heart rate, making the patient feel that there is a state of hypoxia, and an aggravation of the symptoms of chest tightness, shortness of breath, and wheezing may occur. If the patient can do the usual prevention of respiratory infections, as well as appropriate and reasonable respiratory exercise training, through standardized care and protection, can properly improve lung function, can reduce symptoms and improve the quality of life.