Drooling may be a neurological disorder, a gastrointestinal disorder or an oral disorder. 1. Neurological disorders, including cerebral hemorrhage or cerebral infarction, can cause numbness, crooked mouth or drooling. 2. Gastrointestinal diseases, such as gastritis or gastroesophageal reflux, can also lead to drooling. 3. Oral diseases, such as gingivitis, periodontitis or oral ulcers, can stimulate the salivary glands and lead to an increase in salivary secretion, and babies with teething problems can drool. So the drooling is mostly seen in the above situations, you can go to the neurology or gastroenterology, stomatology, and follow the doctor’s instructions to deal with.