Drooling From One Side of the Mouth

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Medically Reviewed By:

Bret Mobley

Bret Mobley, MD, MS


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Content updated on Sep 6, 2022

About the symptom

Drooling is when saliva comes out of your mouth. Problems swallowing, problems with muscle control, or too much saliva production can cause drooling. It can also happen during sleep if you sleep with your mouth open.

When to see a doctor

Seek professional care if you experience any of the following symptoms

  • Drooling from one side of the mouth

Possible causes

  • Parkinson disease (PD)

    A progressive nervous system disorder that affects movement. It occurs as a result of nerve cell damage in the brain. The exact cause for PD is unknown. Risk factors include genetics, male gender, old age and exposure to certain toxins and environmental factors.

Related serious diseases

  • Bell's palsy

    Characterized by sudden weakness or paralysis of the facial muscles. It's usually temporary and occurs on one side of the face. The exact cause is unknown, but believed to be due to swelling and inflammation of the nerve controlling the muscles of the face or viral infection. This condition can anyone. Pregnant women, those with lung infections and those with a family history of the condition are at higher risk.

  • Guillain-Barre syndrome (GBS)
  • Tetanus

Questions your doctor may ask about this symptom

Your doctor may ask these questions to check for this symptom

  • Do you drool liquid from one side of your mouth when drinking?

  • Do you have difficulty pronouncing words properly?

  • Do you have difficulty controlling the muscles of your face?

  • Do you have difficulty opening your mouth?

  • Do you have difficulty swallowing (e.g food or water)?

Other Related Symptoms

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Medically Reviewed By:

Bret Mobley

Bret Mobley, MD, MS


From our team of 50+ doctors

Just 3 minutes.
Developed by doctors.

Ubie is supervised by 50+ medical experts worldwide

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