Drooling is mainly due to the following reasons: a. For children who have had difficult labor, ischemia, hypoxia and other symptoms caused by intrauterine distress during delivery. It may lead to cerebral palsy, and children with cerebral palsy may have drooling because of the incomplete development of the brain and the diminished intelligence. Second, if the drooling is at night, it is related to the relaxation of the muscles in the oropharynx during sleep at night. Third, if the daytime drooling, accompanied by choking and coughing, slurred speech, and weakness of one limb, this time to be alert to the possibility of acute cerebrovascular disease, you need to go to the hospital to do a cranial magnetic resonance examination to understand whether there is a cerebral infarction or cerebral hemorrhage. In short, drooling is mainly due to the above three reasons.