Chronic rejection, infection, and cardiovascular system complications may occur three months after lung transplantation. 1. Chronic rejection: Rejection is milder than acute rejection in the early postoperative period and may persist after lung transplantation. 2. Infection: lung transplant recipients need to use immunosuppressants for a long time after lung transplantation to avoid rejection, but at the same time, it also suppresses the body’s immune function, which can easily cause infections, resulting in fever, cough, sputum and other symptoms. 3. Complications of cardiovascular system: three months after lung transplantation, complications of cardiovascular system may occur. Including heart failure, arrhythmia, thrombophilia and so on. Three months after lung transplantation, you should pay close attention to the rejection reaction, avoid infection, exercise appropriately, and eat a balanced diet. Take immunosuppressant drugs as prescribed by the doctor and have regular review.