Do not stop prescription medication on your own simply because you suspect it is contributing to drooling.

A healthcare professional can determine whether the medication is a likely cause and whether an alternative treatment is appropriate.

6. Difficulty Swallowing Can Cause Excess Saliva to Build Up

Another possibility is dysphagia, or difficulty swallowing.

Normally, people swallow saliva automatically throughout the day and night. If swallowing becomes difficult or less coordinated, saliva can accumulate in the mouth and eventually spill out.

Difficulty swallowing may be associated with various conditions affecting the throat, muscles, nerves, or esophagus.

Potential warning signs include:

• Coughing or choking while eating

• Food feeling stuck in the throat

• Repeated throat clearing

• Wet or gurgly voice after swallowing

• Unexplained weight loss

• Difficulty swallowing liquids

• Frequent respiratory infections

If drooling occurs together with these symptoms, medical evaluation is important.

7. Neurological Conditions Can Affect Saliva Control

In some cases, excessive drooling is related not to increased saliva production but to reduced control over the muscles involved in swallowing.

Certain neurological disorders can affect coordination of the lips, tongue, jaw, and swallowing muscles.

Examples include conditions such as Parkinson's disease, stroke-related impairment, and other neurological disorders.

Drooling by itself does not mean that someone has a neurological disease.

However, if excessive drooling develops suddenly or is accompanied by facial weakness, difficulty speaking, weakness on one side of the body, confusion, or difficulty swallowing, urgent medical attention may be necessary.

Sudden facial weakness or difficulty speaking can be signs of a stroke and should never be dismissed as a simple sleep issue.

Is Drooling While Sleeping a Sign of a Serious Disease?

Usually, no.

Occasional nighttime drooling is extremely common and can simply result from sleeping position, deep sleep, or temporary nasal congestion.

The important distinction is between occasional drooling and persistent, excessive, or newly developed drooling accompanied by other symptoms.

A wet pillow alone is not a reliable diagnostic sign.

Social media posts sometimes claim that drooling during sleep means your body is “detoxifying,” that your brain is failing to function properly, or that you definitely have a serious disease.

There is no scientific basis for these sweeping claims.