Drooling in adults is also known as salivation, which is a symptom of increased saliva production and is generally classified as physiological salivation and pathological salivation. Pathological drooling refers to abnormal drooling, which is mostly seen in stomatitis, facial nerve palsy, cerebral palsy, Down’s syndrome, Alzheimer’s disease, Parkinson’s disease, cerebrovascular disease, etc. Therefore, when a patient has drooling, it is important to consult the relevant department promptly. You can start by going to the dentistry department for an examination of the mucous membrane inside the mouth, etc. If oral problems are excluded, a detailed neurological examination and a CT or MRI scan of the skull will be performed to look at the structure of the intracranial tissues and the nature of the lesion. At the same time, electromyography and electroencephalography can be performed to clarify the diagnosis and provide timely treatment.