Pharyngitis is divided into different types, and the source of sputum produced by each type is different: 1. In common pharyngitis, sputum is mainly produced by the posterior pharyngeal wall, the root of the tongue, and lymphatic follicle hyperplasia, which is clinically the most common. 2. Some patients have recurrent rhinitis, sinusitis, and long-term reflux nasal discharge into the pharynx leading to pharyngitis in patients, when sputum is mainly composed of nasal discharge and other secretions. 3. Some patients have long-term Pneumonia, bronchitis, long-term cough, coughing phlegm, this phlegm mainly from the lungs and trachea, clinically manifested phlegm pharyngitis. 4, some patients have reflux esophagitis, reflux gastritis, long-term gastric acid and other gastric contents reflux flow into the pharynx formed by phlegm. Therefore, patients with pharyngitis produce phlegm, and the causes of phlegm production should be analyzed according to the patient’s medical history, symptoms, and characteristics.