Usually the causes of drooling are as follows: i. In neurological diseases, such as acute cerebral hemorrhage, acute cerebral embolism, and acute cerebral infarction, crookedness of the mouth and drooling can occur. Second, in diseases of the gastrointestinal tract, such as acute reflux gastritis, acute gastroenteritis, acute bile reflux gastritis, and pancreatitis, drooling can also occur during infection if the patient had acute gastric mucosal erosion or acute gastroduodenal bulb ulcer in the past. 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.