Chronic obstructive pulmonary disease (chronicobstructivepulmonarydisease,COPD), or COPD for short, is a group of common preventable and treatable diseases characterized by persistent airflow limitation. Individual susceptibility factors include α1-antitrypsin deficiency, smoking, and occupational dust exposure. It is also associated with chemicals, infections, and socioeconomic status. The clinical condition of each COPD patient depends on the severity of the symptoms, the systemic effects and the various comorbidities the patient suffers from. Common symptoms are: 1. wheezing and chest tightness: also a symptom, but not specific, some patients are easily misdiagnosed as bronchial asthma. 2. Chronic cough: usually the first symptom, starting with an intermittent cough, heavier in the morning, and later in the morning and evening or throughout the day, but the cough is not significant at night, and in some cases there is no coughing sputum. 3. Shortness of breath or dyspnea: It is the hallmark symptom of COPD and the main cause of anxiety in patients, which appears only during exertion in the early stage and gradually worsens to the point that shortness of breath is felt even during daily activities and even at rest. 4. Coughing up sputum: after coughing up a small amount of mucus sputum, some patients have more sputum in the early morning, and when combined with infection, the sputum volume increases, often with purulent sputum, and when combined with infection, blood can be coughing up. 5, other symptoms: weight loss, malnutrition, etc., may be combined with myocardial infarction, angina pectoris, osteoporosis, etc. Signs: Early signs of COPD can be non-stellar. As the disease progresses, the following signs are often present: 1. Visual and palpation abnormalities of the thorax: including excessive expansion of the chest, increased anterior and posterior diameters, widening of the inferior sternal angle under the saber and abdominal bulging, etc., common shallow breathing, accelerated frequency, auxiliary respiratory muscles to participate in the movement, severe patients can be seen thoracoabdominal contradictory movement, mucous membrane and skin cyanosis may appear in hypoxemia, with right heart failure can be seen in the lower limbs edema, liver enlargement. Auscultation: Breath sounds of both lungs can be reduced, prolonged expiration, dry rales can be heard during calm breathing, wet rales can be heard at the base of both lungs or other lung fields; heart sounds are distant, and fenestra heart sounds are more clear and loud. 3. Percussion: Due to the hyperinflation of the lungs, the patient’s cardiac and hepatic borders are narrowed, the lung and liver borders are lowered, and the lung percussion is hyperclear. In case of acute exacerbation of COPD, the symptoms are more obvious, with increased shortness of breath, wheezing, chest tightness, increased cough, increased sputum, etc. General malaise, insomnia, drowsiness, fatigue, depression and mental disorders may also appear.