The first condition, chronic laryngitis, may be due to repeated inflammatory stimulation of the throat and local exudation, resulting in repeated salivation. In the second case, the patient has reflux laryngitis, in which gastroesophageal fluid refluxes into the throat, causing the patient to gag repeatedly. In the third case, the patient may be nervous and subconsciously gagging to relieve his nervousness. In the fourth case, the patient has sinusitis and rhinitis, and often the snot flows back into the throat, and the patient gulps repeatedly to relieve the discomfort caused by the snot flowing back into the throat. Patients who have throat discomfort and keep trying to swallow saliva are advised to go to the ENT department to check the condition of nasal cavity, nasopharynx, oral cavity, oropharynx, gastroesophagus and other related diseases.