The usual causes of drooling are as follows: i. In neurological diseases, such as acute stroke, acute cerebrovascular accident, acute cerebral hemorrhage, acute cerebral embolism, and acute cerebral infarction, there is a reflexive increase in saliva and secretions. Second, gastrointestinal diseases, such as acute reflux gastritis, acute gastroenteritis, acute bile reflux gastritis and pancreatitis, if the patient has acute gastric mucosal erosion or acute gastroduodenal bulb ulcer in the past, there will also be drooling during the infection. Third, excessive intake of acidic food will also appear drooling. Fourth, when children change their teeth and infants grow teeth, unconscious drooling may also occur.