What might cause excess saliva on the right side of the mouth?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Excess saliva on one side of the mouth, known as unilateral hypersalivation, is often caused by a localized issue affecting the salivary glands or an imbalance in how nerves and muscles regulate saliva production on that side. Common causes include salivary gland infections, blocked ducts, dental problems, oral irritation, or nerve-related conditions affecting one side of the face.

Because one-sided drooling or saliva buildup can point to a wide range of underlying issues—some minor, some requiring prompt care—it's worth understanding what may be driving your symptoms before deciding on next steps. Taking a free, instant, online symptom check can help you narrow down possible causes based on your specific situation, giving you clearer direction on whether to monitor at home, see a dentist, or consult a doctor.

Reviewed for medical accuracy: 07/15/2026

Important Next Steps

Learn why right-side mouth drooling happens Discover if your excess saliva needs care Find likely causes of one-sided mouth salivation See OTC options for excess saliva relief Find a doctor for saliva problems Understand home remedies for excess saliva Find out if saliva symptoms are serious

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Explanation

There are a few reasons why you could have more saliva pooling on one side of your mouth.

One possibility is that a salivary gland—like your parotid or submandibular gland—on that side may be overactive, blocked, or irritated by an infection or inflammation. This can lead to extra saliva production or trouble draining saliva effectively.

Another possibility is that the nerve signals or muscle control on one side of your face may be slightly out of balance. Conditions that affect the nerves or muscles, such as those that sometimes occur in neurological disorders, can make it more difficult for you to swallow or keep saliva inside, which might result in drooling on one side.

Additionally, certain medications or systemic disorders that influence salivary secretion might play a role. If you notice that the excess saliva comes with pain, swelling, or other unusual symptoms, you can use a free symptom checker to help identify potential causes and determine whether you should consult with a healthcare provider for further evaluation or treatment.

(References)

Miranda-Rius J, Brunet-Llobet L, Lahor-Soler E, Farré M. Salivary Secretory Disorders, Inducing Drugs, and Clinical Management. Int J Med Sci. 2015 Sep 22;12(10):811-24. doi: 10.7150/ijms.12912. PMID: 26516310; PMCID: PMC4615242.
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.
Leung AK, Kao CP. Drooling in children. Paediatr Child Health. 1999 Sep;4(6):406-11. doi: 10.1093/pch/4.6.406. PMID: 20212951; PMCID: PMC2827743.

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