There are several clinical situations that lead to the patient’s throat always being dry: First, it may be related to the patient’s occupational factors, such as the patient is a teacher who often speaks and may have a dry mouth. Secondly, if the patient often works inside a hot environment, it will lead to a decrease in the secretion function of the mucous membrane of the pharyngeal cavity, and it is likely that the patient himself does not pay attention to the supplemental water and does not drink water frequently. Third, the main consideration is that the patient has an autoimmune system disease, the pharyngeal cavity mucous membrane secretion function decline is particularly obvious, such patients often need to apply immunosuppressive drugs to relieve symptoms. Fourth, if the patient has pharyngitis will also appear dry throat mucosa, it is recommended to actively clear the diagnosis after symptomatic treatment.