Postnasal drip syndrome, also known as upper airway cough syndrome, can mainly manifest as chronic cough and pharyngeal foreign body sensation and so on. Upper airway cough syndrome, mainly due to rhinitis or sinusitis patients in the nasal cavity inflammatory secretions flow backward into the nasopharynx, oropharynx, laryngopharynx and other parts of the pharynx, stimulating the mucous membrane of the pharynx, thus causing pharyngeal discomfort, chronic cough and a series of performance. Clinical manifestations: chronic paroxysmal or persistent cough occurs. Cough often occurs during the day, and can be weakened at night during sleep. Intranasal secretion backflow can cause discomfort in the pharynx, itching, foreign body sensation, frequent throat clearing, causing reflex cough; allergic rhinitis patients may also have nasal itching, nasal congestion, runny nose, sneezing and other symptoms. A few patients may also have symptoms such as hoarseness. Nasal secretion reflux and chronic cough and other uncomfortable symptoms, it is recommended to go to the hospital, diagnosis and standardized treatment.