A combination of long-term smoke, haze, dust and respiratory infections can lead to inflammation and edema of our airways, especially the small airways connecting the alveoli. Trachea diameter becomes thin, hardened, so the same gas in and out of the narrow airways will need more time and power, so we will be gasping for breath, especially when an activity requires more oxygen supply, this situation will be more obvious, can not be successfully discharged in the respiratory cycle of the accumulation of more gas leads to accumulation of residual gas in the lungs, the formation of emphysema alveoli, and continue to develop to the thorax into a bucket loaded, we call the bucket chest, the process of chest swelling and pain is very common. Chest swelling and pain are very common in this process. When the narrowing of the airways, the airflow rate decreases to reach a certain target, we diagnose chronic obstructive pulmonary disease (COPD) after using pulmonary function measurements. The main manifestation of chest tightness and shortness of breath, combined with cough and sputum. Smoking cessation, active treatment of acute respiratory infections and treatment of asthma is the key to prevention, the diagnosis requires a longer period of treatment, my experience is generally one week to three months will improve, it is recommended that the respiratory specialties of major hospitals active treatment, and regular recheck pulmonary function! Lung function tests are recommended for smokers, especially those with symptoms, for early prevention and treatment!