Always swallowing saliva may be considered to be their own bad habits, oral diseases, pharyngitis, etc., if a long time does not relieve, it is recommended to consult a doctor in a timely manner to clarify the specific causes of the disease. 1. own bad habits: some people will have the habit of swallowing saliva, when the glands in the mouth to secrete more, this performance is frequent, obvious, but generally do not need special treatment. 2. Oral diseases: such as periodontitis, gingivitis, oral ulcers and other patients may be stimulated by inflammation leading to increased saliva secretion. 3. Pharyngitis: when there is inflammation of the throat, the mucous membrane of the throat is stimulated, and the local tissues may have abnormal symptoms such as edema, which may cause stimulation of the salivary glands, resulting in an increase in saliva, and the patient may have the phenomenon of gagging all the time. There may also be other reasons for constant salivation. If the situation persists for a long time, or is more serious, it is recommended to seek medical attention to identify the cause.