Chronic obstructive pulmonary disease (COPD) may have no symptoms in the early stages of the disease, but the disease progresses and worsens, resulting in shortness of breath during daily activities and at rest, which can become a serious and even life-threatening condition. Chronic Obstructive Pulmonary Disease (COPD), or chronic obstructive pulmonary disease (COPD), is a common, preventable and treatable disease with persistent airflow limitation and respiratory symptoms. Chronic obstructive pulmonary disease starts slowly and has a long course. Early in the course of the disease, patients may have no conscious symptoms. As the disease progresses, chronic cough, sputum, shortness of breath, wheezing and chest tightness may occur in some patients, especially those with severe disease, and weight loss and loss of appetite may occur in patients with advanced stage of the disease. If chronic obstructive pulmonary disease is not actively treated, further development of the disease will appear chronic respiratory failure, spontaneous pneumothorax, chronic pulmonary heart disease and other serious complications, and even life-threatening. Smoking cessation is the most important preventive measure against COPD, which helps to prevent the occurrence and development of COPD. For people with high risk factors for COPD, regular lung function tests can be performed for early detection and treatment.