The discomfort of phlegm in the throat is due to the occurrence of pharyngitis, a condition usually referred to as upper respiratory tract infection, which is usually caused by a cold virus, with bacterial infections often occurring after viral infections. Mycoplasma or Chlamydia can also cause upper respiratory tract infections that can lead to pharyngitis. Once there is inflammation in the throat, there will be localized congestion and edema, accompanied by inflammation and also redness, swelling, heat and pain, so the throat will feel uncomfortable. The inflammatory site will also secrete inflammatory secretions, and inflammatory cells in the body will gather in the throat to devour foreign viruses or bacteria. As the cells undergo lysis and necrosis, the bodies accumulate in the throat. The pharynx will also shed mucous membranes, leading to the formation of phlegm, which will feel uncomfortable with phlegm in the throat. You need to take anti-inflammatory drugs, such as busulfan anti-inflammatory oral solution, and phlegm-reducing drugs, such as lung power cough combination for treatment.