When Xiao Liang finally visited a doctor about his persistent drooling, the physician noticed something important: Xiao Liang always drooled on the same side. This detail prompted a brain CT scan. The results revealed early signs of cerebral blood vessel blockage—a warning that could have led to stroke if left undetected.
Thanks to early intervention, Xiao Liang avoided serious complications. His story is a powerful reminder: nighttime drooling isn't always harmless.
💧 Where Does Saliva Come From?
Understanding drooling starts with understanding saliva itself.
The Salivary System
Component
Function
Parotid glands (near ears)
Produce watery saliva rich in enzymes
Submandibular glands (under jaw)
Produce mixed saliva (watery + mucus)
Sublingual glands (under tongue)
Produce thicker, mucus-rich saliva
Minor salivary glands (throughout mouth)
Keep oral mucosa moist
Key Facts About Saliva
Healthy adults produce 1–1.5 liters per day (~30 ml/hour)
Saliva is controlled by the autonomic nervous system—it's involuntary, like your heartbeat
Functions include:
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