In the case of limited emphysema in the upper lobe of the left lung, if the clinical symptoms are not obvious, no medication is needed, but it is important to pay attention to rest, avoid cold and infection, and exercise in moderation to maintain lung function. If the patient has an obvious cough, he may use cough suppressants, such as compound licorice tablets, strong loquat, suhuang cough capsules, pulmonary cough combination, dextromethorphan, pentoxifylline, etc. If the patient has phlegm that cannot be coughed up, expectorant medications can be used, such as tranylcypromine, eucalyptus pinene, acetylcysteine, etc. When a patient has cough, fever and yellow sputum, clinical considerations do not exclude the presence of bacterial infections, so routine blood tests, C-reactive protein, calcitoninogen and other related tests can be completed. If patients are diagnosed with bacterial infection, they need to be treated with antibiotics, such as cefixime, amoxicillin, azithromycin, levofloxacin, etc.