Why do adults drool during sleep?

In general, drooling during sleep in adults refers to the secretion of saliva while sleeping. This condition may be caused by improper sleeping posture, aging, indigestion, oral ulcers, gastroesophageal reflux disease (GERD), and other factors. It is recommended to seek medical attention promptly, identify the underlying cause, and receive appropriate treatment under the guidance of a healthcare professional. Specific causes are analyzed as follows:

1. Improper sleeping posture

When adults sleep on their side or stomach, the muscles of the mouth and throat tend to relax, which may lead to uncontrolled drooling. Adjusting the sleeping position—such as switching to a supine (back) position—or using specially designed pillows to support the head may help reduce saliva leakage.

2. Aging

With age, facial muscle elasticity decreases. During nighttime rest, muscle relaxation becomes more pronounced, making it easier for saliva to leak out. Facial muscle exercises are recommended to improve muscle tone. Maintaining good oral hygiene and regular dental checkups are also beneficial.

3. Indigestion

Individuals with indigestion may experience increased salivation due to gastrointestinal discomfort, leading to excessive saliva production during sleep. Increasing dietary fiber intake—such as consuming more vegetables, fruits, and whole grains—can promote intestinal motility and improve digestive function.

4. Oral ulcers

Oral ulcers are usually caused by poor diet. The ulcerated area may become swollen and painful, potentially triggering increased salivation during sleep. Symptoms often include bad breath and gum bleeding. It is recommended to use medications such as metronidazole gel, cydiodine lozenges, and vitamin C tablets as directed by a physician.

5. Gastroesophageal reflux disease (GERD)

GERD occurs when stomach contents flow back into the esophagus. Stomach acid can reflux into the esophagus and even the mouth, stimulating the salivary glands and causing increased salivation during sleep. Common accompanying symptoms include heartburn, chest pain, and difficulty swallowing. Treatment may include medications such as omeprazole enteric-coated capsules, hydrotalcite chewable tablets, and rabeprazole sodium enteric-coated tablets, as prescribed by a doctor.

Regular tooth brushing and proper oral hygiene can help prevent oral ulcers. Additionally, moderate physical activity can boost the immune system.