A sore throat with phlegm occurs because of inflammation of the throat, which can be caused by a variety of factors, including bacterial inflammation and viral inflammation. In addition, mycoplasma or chlamydia infections can also cause inflammation of the throat. Whenever inflammation occurs, there will be localized congestion and edema. In addition, the most important characteristics of inflammation are redness, swelling, heat and pain, so there will be symptoms of sore throat. There is exudation of inflammatory substances, so sputum will be formed. At this time, if the infection is bacterial, you can take antibiotics to treat it, such as cefixime or cefaclor. If the infection is viral, you can take antiviral Chinese medicine to relieve the symptoms, such as Pu Di Lan Anti-inflammatory Oral Liquid or Blue Scutellaria Oral Liquid. If the inflammation is caused by mycoplasma or chlamydia, macrolide antibiotics, such as azithromycin, should be used for treatment.