Xiao Liang, a 25-year-old programmer from China, began experiencing drooling while sleeping, which embarrassed him. After seeking medical advice, a CT scan revealed early signs of cerebral blood vessel blockage, preventing the risk of a stroke.

Drooling is involuntary, controlled by the autonomic nervous system. It can result from mouth breathing, stress, fatigue, or sleeping positions. In children, drooling is common due to weak oral muscles. In adults, persistent drooling may signal conditions such as oral diseases, facial paralysis, gastroesophageal reflux, Parkinson’s disease, cerebral thrombosis, or arteriosclerosis.

To reduce drooling, individuals can change sleeping positions, maintain oral hygiene, and consult a doctor if medications are involved.