In general, the phenomenon of phlegm is due to the respiratory system infection, if the infection is not very serious, you can first use dietary therapy for expectorant treatment, the effect is relatively fast. First of all, you can cook ice sugar pear water, take a pear clean, cut the pear into small pieces, put it in a pot, add 10g of ice sugar, then add two big bowls of water, put in a pot to cook for more than 20 minutes, drink it while it is still hot, for the expectorant is very fast, very effective. If the infection is more serious, you need to use cough and expectorant drugs for treatment, for example, you can use Ambroxol hydrochloride or Ambroterol oral solution. In case of yellow phlegm, you can use Lung Li Cough Compound or Compound Fresh Bamboo Leech Liquid for treatment. Anti-inflammatory treatment is the fastest and most effective way to get rid of phlegm. Depending on the type of infection, you need to choose the right antibiotic or anti-viral medication for anti-inflammatory treatment to get better results.