Bell's palsy is a sudden weakness or paralysis on one side of the face. It is usually a temporary condition.
The exact cause of Bell's palsy is unknown. It is thought to be a result of an infection or inflammation that affects the nerve.
Factors that may increase your risk of Bell's palsy include:
Bell's palsy symptoms may come on suddenly or develop over a few days. Initial symptoms may include:
Symptoms of advanced Bell's palsy may include:
Late complications can occur 3-4 months after onset and can include:
Symptoms will often go away on their own within a few weeks. Bell's palsy may resolve after a few months in many people. In some cases, some symptoms of Bell's palsy may never go away. The recovery rate decreases with increasing age.
You will be asked about your symptoms and medical history. A physical exam will be done. The diagnosis is usually made with just the physical exam. Information from your health and medical history may be used to determine a potential cause.
Concern about infections, cancer, or other specific causes may require further testing. Tests may include:
For most, treatment is not needed. You may be referred to a specialist if you have eye problems, if your symptoms worsen, or if your recovery takes longer than expected.
If an underlying cause of the Bell's palsy is known, it may be treated. Treatment for underlying conditions may include medication or surgery.
Your doctor will likely prescribe corticosteroids if your symptoms have been present for a short time.
Antiviral medications along with corticosteroids may be advised. There is no evidence that antiviral medication alone has any benefit.
If the paralysis includes your eyelid, you may need to protect your eye. This may include:
Massaging the weakened facial muscles may also help.
Centers for Disease Control and Prevention
National Institute of Neurological Disorders and Stroke
Public Health Agency of Canada
Bell's palsy. Family Doctor—American Academy of Family Physicians website. Available at: http://familydoctor.org/familydoctor/en/diseases-conditions/bells-palsy.html. Updated April 2014. Accessed August 28, 2015.
Bell's palsy. American Academy of Otolaryngology—Head and Neck Surgery website. Available at: http://www.entnet.org/?q=node/1465. Updated February 2013. Accessed August 28, 2015.
Bell palsy. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T116940/Bell-palsy. Updated April 11, 2016. Accessed October 13, 2016.
Finsterer J. Management of peripheral facial nerve palsy. Eur Arch Otorhinolaryngol. 2008;265(7):743-752.
Grogan PM, Gronseth GS. Practice parameter: Steroids, acyclovir, and surgery for Bell’s palsy (an evidence based review): Report of the Quality Standards Subcommittee of the American Academy of Neurology. Neurology. 2001;56(7):830-6.
NINDS Bell’s palsy information page. National Institute of Neurological Disorders and Stroke website. Available at: http://www.ninds.nih.gov/disorders/bells/bells.htm. Updated April 16, 2015. Accessed August 28, 2015.
Quant EC, Jeste SS, Muni RH, et al. The benefits of steroids versus steroids plus antivirals for treatment of Bell's palsy: A meta-analysis. BMJ. 2009;339:b3354.
Schwartz SR, Jones SL, Getchius TS, Gronseth GS. Reconciling the clinical practice guidelines on Bell’s palsy from the AA-HNSF and the AAN. Neurology. 2014;82(21):1927-1929.
11/6/2007 DynaMed's Systematic Literature Surveillance http://www.dynamed.com/topics/dmp~AN~T116940/Bell-palsy: Sullivan FM, Swan IR, Donnan PT, Morrison JM, et al. Early treatment with prednisolone or acyclovir in Bell's palsy. N Engl J Med. 2007;357(16):1598-1607.
1/6/2009 DynaMed's Systematic Literature Surveillance http://www.dynamed.com/topics/dmp~AN~T116940/Bell-palsy: Engstrom M, Berg T, Stjernquist-Desatnik A, et al. Prednisolone and valaciclovir in Bell's palsy: A randomised, double-blind, placebo-controlled, multicentre trial. Lancet Neurol. 2008;7(11):993-1000.
9/15/2009 DynaMed's Systematic Literature Surveillance http://www.dynamed.com/topics/dmp~AN~T116940/Bell-palsy: Goudakos JK, Markou KD. Corticosteroids vs corticosteroids plus antiviral agents in the treatment of Bell palsy: A systematic review and meta-analysis. Arch Otolaryngol Head Neck Surg. 2009;135(6):558-564.
9/15/2009 DynaMed's Systematic Literature Surveillance http://www.dynamed.com/topics/dmp~AN~T116940/Bell-palsy: de Almeida JR, Al Khabori M, Guyatt GH, et al. Combined corticosteroid and antiviral treatment for Bell palsy: a systematic review and meta-analysis. JAMA. 2009;302(9):985-993.
2/13/2014 DynaMed's Systematic Literature Surveillance http://www.dynamed.com/topics/dmp~AN~T116940/Bell-palsy: Baugh BF, Basura GJ, Ishii LE, et al. Clinical practice guideline: Bell's palsy. Otolaryngol Head Neck Surg. 2013;149(3 Suppl):S1-S27.
Last reviewed September 2016 by Rimas Lukas, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.