The differential diagnosis of chronic obstructive pulmonary disease includes four points, mainly from the symptoms to differentiate: 1. Wheezing symptoms: Chronic obstructive pulmonary may show wheezing symptoms, and some other diseases can also show wheezing, especially the more typical diseases such as bronchial asthma, which can be differentially diagnosed. Patients with bronchial asthma have an onset at a young age and have a history of allergies, which can be sudden and sudden; patients with chronic obstructive pulmonary disease have an onset after middle age, and such patients often have a long history of smoking, and the disease process is slow, so these two diseases are easier to distinguish; 2. Chronic cough: Because chronic bronchitis and chronic obstructive pulmonary disease can cough, many diseases such as tuberculosis, bronchiectasis, and even lung cancer can have a cough. There are more chronic cough diseases, and these are the more typical categories. From the perspective of tuberculosis, bronchiectasis, and lung cancer, patients with bronchiectasis have recurrent cough, sputum, yellow sputum, and recurrent hemoptysis, which can be differentiated from these symptoms. The differential diagnosis of disease can also be made from chest CT; 3. Exertional shortness of breath: Patients with chronic obstructive pulmonary disease will be combined with emphysema, and patients may have symptoms such as shortness of breath after activity or shortness of breath after upstairs activity, and some diseases such as coronary heart disease, hypertension, and heart valve disease may have symptoms of shortness of breath, and these cases need to be differentiated, and can be differentiated through cardiology examination; there are also some benign compensatory emphysema, such as There are also some benign compensatory emphysema, such as senile emphysema, which may have mild symptoms and the patient may not have a long history of smoking, and can be identified based on some clinical information of the patient.