Drooling on the right side of the face may be a precursor to cerebral infarction, and diseases such as central facial nerve paralysis can also lead to similar symptoms. 1. Cerebral infarction: Cerebral infarction will lead to local blood circulation obstacles, insufficient blood supply to the brain caused by ischemia and hypoxia of brain tissue, resulting in local nerve loss, neuroinflammation, neurological dysfunction, and accordingly numbness of the face or limbs, drooling and other symptoms. 2. Central facial nerve palsy: facial nerve palsy is divided into central facial nerve palsy and peripheral facial nerve palsy. Central facial nerve palsy is characterized by paralysis and numbness of the lower part of the face on the opposite side of the lesion, shallow nasolabial folds, crooked corners of the mouth, but the forehead lines exist. When the right side of the face feels numb and a little bit want to drool, it is recommended to consult a doctor in time, clarify the cause under the guidance of the doctor and choose the appropriate treatment.