The diagnosis of chronic obstructive pulmonary disease (COPD) was made based on medical history, clinical symptoms and information, and after inhalation of bronchodilators with FEV1/FVC <70% and exclusion of other airflow limiting diseases. Patients with COPD often have a history of long-term smoking and other high-risk factors. Typical clinical manifestations of COPD include recurrent episodes of chronic coughing, sputum and wheezing, etc. Coughing is usually more pronounced in spring and winter, and sputum is often white mucus sputum or foamy sputum. As the disease progresses, patients may experience shortness of breath or dyspnea during activities, and some patients may also experience barrel-shaped chest and rales. To make a diagnosis of COPD, pulmonary function tests are necessary to determine that there is persistent airflow limitation. A patient's FEV1/FVC <70% after inhaled bronchodilators is the criterion for determining airflow limitation. On this basis, if other diseases with similar clinical manifestations of airflow limitation can be excluded at the same time, the diagnosis of chronic obstructive pulmonary disease can be made. If you feel unwell, please consult a doctor promptly.