For phlegm, you should eat a light diet and eat foods or medicines that strengthen the spleen and dissolve phlegm, such as snow pear, loquat, yam and lily of the valley. You can take expectorant drugs orally, such as bromohexine hydrochloride, aminoglutethimide hydrochloride, acetylcysteine, etc. If there are obvious dry and wet rales on auscultation of both lungs, antibiotic drugs can be used to control intrapulmonary infection, such as amoxicillin, cefuroxime, roxithromycin, and ofloxacin. Oral Chinese medicines can also be given, such as Acute Branch Syrup, which has the effect of clearing heat and resolving phlegm, promoting the lung and relieving cough; Tong Xuan Li Lung Pill has the effect of warming and resolving cold phlegm. You can also take Chinese herbal tonics to regulate phlegm, which is usually seen in the evidence of phlegm-heat in the lung, and can be reduced by combining Er Chen Ping Gastric San Zi Yang Yin Tang. If the phlegm is not easy to cough up, you can add Bai Qian, Su Zi and Lycopodium to dissolve the phlegm and lower the Qi. If the cold phlegm is heavy, coughing white mucous phlegm, you can add dried ginger, fine spice and white mustard seed to warm the cold phlegm.