What are the causes of facial numbness on the left side?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Left-sided facial numbness is most commonly caused by trigeminal neuropathy (damage or irritation to the trigeminal nerve) or carotid artery issues that disrupt blood flow to facial nerves. Other possible causes include stroke, multiple sclerosis, Bell's palsy, or a pinched nerve. Because facial numbness can signal both minor and serious conditions, identifying the underlying cause quickly is essential for effective treatment and preventing complications.

Since the causes range from manageable nerve irritation to medical emergencies like stroke, guessing isn't safe. A free, instant, online symptom check can help you narrow down likely causes based on your specific symptoms, assess urgency, and guide your next steps—whether that's monitoring at home or seeking immediate care.

Reviewed for medical accuracy: 07/14/2026

Important Next Steps

Learn what causes left facial numbness Discover if your facial numbness is serious See whether facial numbness needs urgent care Find OTC relief options for numbness symptoms Find doctors for facial numbness evaluation Discover safe home remedies for facial numbness Find out if facial numbness needs care

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Explanation

Facial numbness on one side, like the left side, can be due to several causes. One significant cause is trigeminal neuropathy, which affects the trigeminal nerve responsible for sensation in the face. This condition can lead to numbness and tingling.

Another possible cause is related to the carotid artery, which supplies blood to the face and brain. Issues with this artery can result in numbness and unusual sensations.

Here are some key points to consider:

Trigeminal Neuropathy: This affects the nerve that carries sensation from your face to your brain. Problems here can cause numbness or tingling on one side of the face.
Carotid Artery Issues: Problems with the blood flow in this artery can also lead to numbness.

Understanding these causes is important to get the right treatment. If you experience facial numbness, you can use this free symptom checker to help identify potential causes, then consult a healthcare professional who can help determine the diagnosis and provide appropriate care.

(References)

Smith JH, & Cutrer FM. (2011). Numbness matters: a clinical review of trigeminal neuropathy. Cephalalgia : an international journal of headache, 21628435.
Francis KR, Williams DP, & Troost BT. (1987). Facial numbness and dysesthesia. New features of carotid .... Archives of neurology, 3827688.
Francois EL, Clark NJ, & Freedman BA. (2019). Facial Numbness and Paresthesias Resolved with Anterior .... JBJS case connector, 31274646.

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