Brain & Nervous System: Bell's Palsy

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Bell's Palsy

What is Bell's palsy?
Bell's palsy is a weakness or paralysis of a facial nerve. The 2 facial nerves control movement of the muscles of expression on each side of your face. When one of the nerves is weak or paralyzed, the affected side of the face droops. You may also have trouble closing the eye on that side.

How does it occur?
The cause of Bell's palsy is not known. A commonly held theory is that a virus causes the nerve to swell. The nerve is then temporarily squeezed against the bony canal through which it passes as it travels from the brain to the face. When this happens, the nerve can no longer control the facial muscles. The muscles become weak or paralyzed and muscle control is lost.

What are the symptoms?
The first symptom may be an ache behind the ear on the affected side of your face. This is followed by weakness or paralysis in the facial muscles on that side. The paralysis usually starts in the lower part of the face. Other possible symptoms are tearing of the eye, decreased taste, a change in hearing, and trouble drinking or chewing. You may slur your words when you talk. The severity of Bell's palsy can vary from a mild weakness to complete paralysis.

Symptoms may develop within a few hours or over a couple of days. The faster the symptoms happen, the more severe the weakness or paralysis is likely to be.

See your healthcare provider soon if you think you might have Bell's palsy. Your provider will want to rule out the possibility of a stroke, which can cause similar symptoms.

How is it diagnosed?
Your health care provider will ask about your symptoms and examine you. Your provider will need to rule out other possible causes of your symptoms, such as an injury, stroke, or tumor. You may have a hearing test or brain scan. Electrical testing of the facial nerve may be done to see how much the nerve is damaged.

How is it treated?
Your provider may prescribe:

steroid medicine, such as prednisone
antiviral medicine, such as acyclovir
physical therapy.

Rarely, when the paralysis is severe, surgery may be done to try to relieve pressure on the nerve.

If the eye on the affected side does not close completely, it needs to be protected from problems such as dust and drying out. This is done by patching the eye or using eyedrops or eye ointments. If the eye is not protected, you could lose vision in that eye.

How long will the effects last?
If you have complete paralysis--that is, no movement of the facial muscles at all--you will probably not have full return of each muscle movement. If you have at least some muscle movement, you have a good chance for a complete recovery.

Even mild cases of Bell's palsy can last several weeks. Complete paralysis may take months to improve as much as it is going to.

Bell's palsy very rarely occurs twice in the same person. If you have facial paralysis again, another problem may be causing it and you should get it checked by your health care provider.

Disclaimer: This content is reviewed periodically and is subject to change as new health information becomes available. The information provided is intended to be informative and educational and is not a replacement for professional medical evaluation, advice, diagnosis or treatment by a healthcare professional.

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