The causes of drooling in children include the following: first, symptoms caused by the eruption of teeth in children, children will have symptoms such as drooling and swollen gums when their teeth are erupting. Secondly, the symptoms are caused by mouth ulcers. Children with mouth ulcers may suffer from pain in the mouth, drooling, and even fever, which can be relieved by applying heat-clearing and detoxifying medications, such as Shuangjinlian Compound. Finally, drooling can also be caused if the child’s intelligence level is significantly low. If the child suffers from trisomy 21, drooling will occur at this time, and the eyes are relatively dull, which is also an important cause of drooling.