Chronic obstructive pulmonary disease does not metastasize into lung cancer. Because chronic obstructive lung is a continuous airflow restriction, clinically, it is a recurrent worsening of dyspnea, cough, sputum, chest suffocation and shortness of breath year by year. Patients will have cough in the early stage, usually in the early morning. If the airway obstruction is serious, the cough will be reduced instead, and the performance of dyspnea will be prominent, and the cough is plasma sputum, and foamy sputum is also mostly cough in the early morning. The early stage of dyspnea is shortness of breath after physical activity and activity, and the more it develops, the more dyspnea may be shortness of breath even when resting or doing daily chores. In the exacerbation stage of chronic obstructive pulmonary disease, patients will also have other symptoms, such as wasting and anxiety. Lung cancer is a malignant tumor that occurs in the mucosa or glands of the airways and has the same causes as chronic obstructive pulmonary disease, such as smoking, air pollution, and occupational exposure. Lung cancer can be diagnosed through fiberoptic bronchoscopy, sputum cytology examination and lung biopsy. Therefore, slow obstructive pulmonary disease and lung cancer are two kinds of diseases, and there is no possibility that slow obstructive pulmonary disease will develop into lung cancer.