The following are possible reasons for the constant consciousness of salivation: 1. Patients with chronic laryngitis have more lymphoid follicular hyperplasia in the posterior wall of the pharynx and the root of the tongue, and the lymphoid follicles have a lot of exudate, which the patient feels is phlegm and keeps swallowing down to form the feeling of salivation. 2. Some patients have sinusitis, and long-term nasal discharge enters the throat, and the patient feels that the nasal discharge becomes phlegm, thus having the feeling of salivation. 3. Some patients may have reflux esophagitis, or reflux gastritis, often gastroesophageal reflux liquid into the throat, stimulating patients repeatedly throat discomfort, and the formation of repeated saliva feeling. 4, some patients such as the role of psychological factors are too nervous, repeatedly through the saliva action to divert their attention to relieve their tension.