The clinical manifestations of postnasal drip syndrome include cough, sputum, runny nose, nasal congestion, and foreign body sensation in the pharynx. The clinical manifestations of postnasal drip syndrome vary depending on the severity of the condition. Postnasal drip syndrome includes the symptoms of primary chronic rhinitis, chronic sinusitis and other symptoms and the discomfort triggered by the backflow of nasal mucus. The main clinical manifestations of paroxysmal or persistent cough, most patients due to nasal secretion backflow can appear pharyngeal discomfort, itching or burning sensation, often clearing the throat, or have a sense of pharyngeal foreign body sensation, pharyngeal blockage or mucus adhesion to the posterior wall of the pharynx. Those caused by acute and chronic rhinitis, acute and chronic sinusitis, allergic rhinitis can also be accompanied by sneezing, runny nose, nasal congestion, nasal pain, headache, dizziness, poor sleep at night, daytime drowsiness, as well as mental instability and memory loss and other symptoms. Postnasal drip syndrome should go to the regular hospital in time, the doctor according to the specific condition to determine whether the symptoms are caused by postnasal drip.