Why: Weakness or paralysis on one side of the face can impair the ability to seal the lips and swallow saliva effectively.
Signs: Drooping on one side of the face, difficulty closing one eye, asymmetrical smile, slurred speech.
3. Gastroesophageal Reflux Disease (GERD)
Why: Stomach acid traveling up the esophagus can trigger a reflex increase in saliva production as the body tries to neutralize the acid.
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Signs: Heartburn, acid taste in the mouth, nighttime coughing, chest discomfort.
4. Neurological Disorders (Parkinson’s Disease, MS, ALS)
Why: These conditions can affect the nerves and muscles responsible for swallowing (dysphagia), causing saliva to pool and leak during sleep.
Signs: Tremors, stiffness, balance issues, changes in speech or coordination, progressive weakness.
5. Sleep Apnea or Obstructive Breathing Issues
Why: Breathing through the mouth during sleep—common in sleep apnea—can cause drooling. It’s often a sign of obstructed nasal or throat airways.
Signs: Loud snoring, gasping for air at night, daytime fatigue, morning headaches.
