Left-Sided Facial Numbness: Causes, When to Seek Help, and More

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Numbness, including facial numbness, is often related to nerve damage. A number of different conditions can affect the facial nerve, triggering symptoms such as left-sided facial numbness. Some of the most common causes of left-sided facial numbness are listed below.

Bell’s palsy

Bell’s palsy is a condition that affects the facial nerve and the muscles of the face. Signs and symptoms of Bell’s palsy include:

facial weakness and paralysis
facial drooping
drooling
ear or jaw pain or pressure on the affected side
increased sensitivity to sound
decreased sensitivity to taste
headache
abnormal tear or saliva production

Bell’s palsy typically affects the entire left side of the face or the entire right side. In rare cases, it affects both sides of the face at the same time.

Symptoms of Bell’s palsy are similar to those of other life-threatening conditions, such as stroke. You should seek medical attention right away for these symptoms.

Infections

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Common bacterial and viral infections can affect the facial nerve, causing numbness on the left side of the face.

Infections that can cause one-sided facial numbness include:

dental infections
influenza (flu)
herpes
HIV or AIDS
Lyme disease
measles
mononucleosis
mumps
respiratory infections
syphilis

Infections can cause numbness in the entire left or right side of the face, or just a part of the face. In some cases, both sides of the face are affected. Additional symptoms are often present.

If you have an infection, seeking treatment may help to alleviate facial numbness.

Migraine headaches

Migraines are intense headaches that can be accompanied by nervous system symptoms, including left-sided facial numbness. Some common migraine symptoms include:

throbbing or pulsing head pain
nausea and vomiting
sensitivity to sounds, light, smells, or touch
blurred vision or vision loss
tingling in the limbs
dizziness and sometimes fainting
difficulty speaking
seeing flashes, shapes, or bright spots

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Migraine headaches can affect the left or the right side of the face. Numbness may appear in parts of the face or the whole face.

You should call a doctor if you experience new symptoms or changes in your migraine pattern. Certain migraine symptoms are similar to the symptoms of a stroke. Seek emergency medical assistance if you experience the symptoms of a stroke.

Multiple sclerosis

Multiple sclerosis (MS) affects the central nervous system, including the brain and spinal cord. Left-sided facial numbness is a common sign of MS. It may be one of the first signs to appear prior to a diagnosis.

Other signs and symptoms include:

pain, numbness, or tingling in the body or limbs, sometimes on one side
vision loss, often in one eye
double vision
tremors and lack of coordination
slurred speech
weakness, dizziness, and fatigue
bladder and bowel problems
sharp, painful sensations during neck movements

MS can cause partial or full numbness on the left side of the face. It can also affect the right side of the face or sometimes both sides of the face.

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MS requires medical treatment. You should make an appointment with your doctor if you experience any of the above symptoms without a known cause.

Stroke

A stroke is a life-threatening condition that can cause numbness on the left side of the face, among other symptoms. The symptoms of a stroke are listed at the beginning of this article.

Facial numbness caused by a stroke can typically affect the entire left side of the face. It can also affect the right side of the face or both sides at the same time.

A stroke is a medical emergency that requires swift action to minimize brain damage. Contact emergency medical services right away.