Strictly speaking, there is no clinical term for the posterior nasal tract. The so-called posterior nasal tract should be the clinical term for the posterior end of the lower nasal tract, which is usually close to the nasopharynx. If there is a discharge from the posterior end of the lower nasal tract, it is usually seen in the following cases: i. Chronic rhinosinusitis. Discharge will be present in the middle and lower nasal tracts and is usually treated conservatively with medications first, such as long term small doses of macrolide antibiotics taken orally, commonly used are roxithromycin and clarithromycin. Glucocorticosteroid nasal spray, commonly used are co-corticosteroids. If ineffective, it needs to be combined with sinus CT scan and, if necessary, transnasal endoscopic surgery. Second, postnasal drip syndrome. In addition to glucocorticoid nasal spray, physiological seawater can be used to irrigate the nasal cavity frequently. Third, adenoid hypertrophy or posterior nostril polyps, blocking the posterior nostril, affecting the drainage caused by the need for surgical treatment.