Drooling From One Side of the Mouth
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Reviewed By:
Bret Mobley, MD, MS (Neuropathology)
Dr. Mobley graduated from the University of Michigan Medical School, completing a masters degree in neuroscience between his second and third years of medical school. He trained as a resident in pathology at Stanford University Hospital before joining the faculty of Vanderbilt University Medical Center in Nashville Tennessee in 2010. He was promoted to Associate Professor in 2018 and to Neuropathology Division Director in 2020.
Shohei Harase, MD (Neurology)
Dr. Harase spent his junior and senior high school years in Finland and the U.S. After graduating from the University of Washington (Bachelor of Science, Molecular and Cellular Biology), he worked for Apple Japan Inc. before entering the University of the Ryukyus School of Medicine. He completed his residency at Okinawa Prefectural Chubu Hospital, where he received the Best Resident Award in 2016 and 2017. In 2021, he joined the Department of Cerebrovascular Medicine at the National Cerebral and Cardiovascular Center, specializing in hyperacute stroke.
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Content updated on Jan 4, 2023
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 affecting movement. It occurs due to 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, Bell's palsy is usually temporary and occurs on one side of the face. The exact cause is unknown but is believed to be due to swelling and inflammation of the nerve controlling the facial muscles or viral infection. Anyone can be affected by this condition, but 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
Similar symptoms or complaints
Symptoms from the same body system / part
Symptoms treated by the same specialty
Reviewed By:
Bret Mobley, MD, MS (Neuropathology)
Dr. Mobley graduated from the University of Michigan Medical School, completing a masters degree in neuroscience between his second and third years of medical school. He trained as a resident in pathology at Stanford University Hospital before joining the faculty of Vanderbilt University Medical Center in Nashville Tennessee in 2010. He was promoted to Associate Professor in 2018 and to Neuropathology Division Director in 2020.
Shohei Harase, MD (Neurology)
Dr. Harase spent his junior and senior high school years in Finland and the U.S. After graduating from the University of Washington (Bachelor of Science, Molecular and Cellular Biology), he worked for Apple Japan Inc. before entering the University of the Ryukyus School of Medicine. He completed his residency at Okinawa Prefectural Chubu Hospital, where he received the Best Resident Award in 2016 and 2017. In 2021, he joined the Department of Cerebrovascular Medicine at the National Cerebral and Cardiovascular Center, specializing in hyperacute stroke.
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Seiji Kanazawa, MD, PHD
Obstetrics and gynecology (OBGYN)
National Center for Child Health and Development, Japan