Chronic Obstructive Pulmonary Disease (COPD) and lung cancer are two different diseases, but COPD is one of the high risk factors for lung cancer. Chronic obstructive pulmonary disease (COPD) is a preventable and treatable disease. It is mainly characterized by persistent respiratory symptoms and airflow limitation. Common symptoms mainly include chronic cough, sputum, shortness of breath, wheezing, chest tightness and dyspnea. Lung cancer is a malignant tumor originating from respiratory epithelial cells. Its symptoms are often more insidious, with cough, sputum, hemoptysis and emaciation. Chronic Obstructive Pulmonary Disease (COPD) can be a high risk factor for lung cancer. Without active treatment and improvement of lifestyle habits, COPD patients have a higher risk of developing lung cancer. If you feel unwell, it is recommended that you consult a doctor in time.