Phlegm in the throat can drink more water, which is conducive to the dilution of phlegm and can promote the discharge of phlegm. You can check the blood routine, chest X-ray, through the blood and image analysis, if the phlegm is caused by viral infection, you can use antiviral drugs symptomatic treatment, such as ribavirin. If the phlegm is caused by bacterial infection, antibiotic drugs can be used, such as penicillins, cephalosporins, macrolides and quinolones. However, quinolones are not suitable for adolescents under 18 years of age. Oral Chinese medicines can also be used to clear heat and resolve phlegm, such as Acute Support Syrup, Honey and Pei Pa Koa Ointment, Strong Pei Pa Koa Luk, and Lung Lik Cough Compound. You can also use Xiao Qing Long Combination, Su Huang Cough Capsules, San Ao Tablets and other medicines to disperse wind and cold. Bambuterol oral solution can also be taken orally, which has the effect of diluting phlegm.