A cough with phlegm in the throat is due to an infection of the upper respiratory system, especially inflammation of the throat, which can occur for a variety of reasons, such as viral, bacterial or mycoplasma infections. In most cases, the inflammation of the throat is caused by a viral infection, which results in congestion and edema. In addition, the throat secretes inflammatory exudates, and neutrophils, eosinophils, or phagocytes gather in the throat to engulf foreign viruses or bacteria, which mix with the inflammatory exudates to form phlegm. This phlegm can irritate the throat and cause a cough to develop, so a cough with phlegm in the throat can occur, and anti-inflammatory medications are often needed to treat it. For pharyngitis, the more commonly used ones are Pu Di Lan Anti-inflammatory Oral Liquid and Blue Baicalin Oral Liquid. If the sputum turns yellow or there is a bacterial infection, antibiotics are needed for treatment.