Hemoptysis is a typical symptom of lung cancer, which is usually caused by tumor tissue invading bronchial mucosa, or may be caused by tumor overgrowth and local necrosis. Lung cancer is a malignant tumor originated from bronchial mucosa or glands in lungs, and the typical symptoms of patients are cough, blood in sputum or hemoptysis, chest pain and so on. Hemoptysis in lung cancer patients is mainly caused by the tumor growing too fast in a short period of time, which leads to local necrosis or the tumor invades blood vessels and causes hemoptysis. Hemoptysis of lung cancer patients indicates that the symptoms are relatively serious and they need to seek medical treatment in time. Some of the patients are in the advanced stage of the disease and they can prolong their life through radiotherapy, targeted therapy and immunotherapy. Hemoptysis is a common symptom of lung cancer, it is recommended that patients keep a good mood and avoid too much tension. Daily need to regulate bad mood and take proper rest. Actively cooperating with doctors to standardize treatment can improve the quality of life.