What might cause a drooling sensation on one side of the mouth?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Drooling on one side of the mouth typically occurs when the muscles or nerves on that side aren't functioning symmetrically, causing saliva to pool and escape from the weaker side. Common causes include facial nerve issues (such as Bell's palsy), stroke, sleep position, dental problems, or temporomandibular joint (TMJ) disorders. In some cases, one-sided drooling can signal a neurological condition that requires prompt medical attention, especially if paired with facial weakness, slurred speech, or numbness.

Because one-sided drooling can range from harmless to a warning sign of a serious condition, understanding the underlying cause matters. Take a free, instant, AI-powered symptom check to explore possible causes based on your unique symptoms and get clear guidance on what steps to take next.

Reviewed for medical accuracy: 07/15/2026

Important Next Steps

Discover why one-sided drooling may be happening See if your drooling needs urgent care Find likely causes of one-sided mouth drooling Explore OTC options for drooling symptoms Find a doctor for mouth drooling causes Learn safe home remedies for drooling relief Understand if drooling signals a serious condition

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Explanation

When you feel a drooling sensation on just one side of your mouth, it means the way your body controls saliva is not the same on both sides. The muscles and nerves in your mouth normally help move and swallow saliva evenly. But sometimes, one side might work a little differently.

For instance, conditions like burning mouth syndrome can change how saliva feels and moves, and cause uneven drooling. Also, if one of your salivary glands is more active or irritated, it might produce more saliva than the other. Certain medications can also cause an imbalance in saliva production. This uneven control may make you notice drooling only on one side of your mouth.

If this happens a lot or is bothersome, you can use a free symptom checker to help identify possible causes and determine whether you should seek medical attention. A healthcare provider can check if there is an issue with your nerve or muscle function and help you find ways to manage the imbalance.

(References)

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Lakraj AA, Moghimi N, Jabbari B. Sialorrhea: anatomy, pathophysiology and treatment with emphasis on the role of botulinum toxins. Toxins (Basel). 2013 May 21;5(5):1010-31. doi: 10.3390/toxins5051010. PMID: 23698357; PMCID: PMC3709276.
Meningaud JP, Pitak-Arnnop P, Chikhani L, Bertrand JC. Drooling of saliva: a review of the etiology and management options. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2006 Jan;101(1):48-57. doi: 10.1016/j.tripleo.2005.08.018. PMID: 16360607.

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