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Tests and diagnosis
By Mayo Clinic staffNo specific laboratory test can confirm a diagnosis of Bell's palsy. Your doctor may be able to make a preliminary diagnosis of Bell's palsy by looking at your face and asking you to move your facial muscles by closing your eyes, lifting your brow, showing your teeth and frowning, among other movements.
Other conditions — such as a stroke, infections, Lyme disease and tumors — also may cause facial muscle weakness, mimicking Bell's palsy. If your diagnosis is still in question, your doctor may recommend other tests, including:
- Electromyography (EMG). This test can confirm the presence of nerve damage and determine its severity. An EMG measures the electrical activity of a muscle in response to stimulation and the nature and speed of the conduction of electrical impulses along a nerve.
- Imaging scans. An X-ray, magnetic resonance imaging (MRI) or computerized tomography (CT) may be needed on occasion to eliminate other possible sources of pressure on the facial nerve, such as an infection, tumor or skull fracture.
- Bell's palsy fact sheet. National Institute of Neurological Disorders and Stroke. http://www.ninds.nih.gov/disorders/bells/detail_bells.htm. Accessed Nov. 10, 2009.
- Ronthal M. Bell's palsy. http://www.uptodate.com/home/index.html. Accessed Nov. 11, 2009.
- Bell's palsy. American Academy of Otolaryngology — Head and Neck Surgery. http://www.entnet.org/HealthInformation/bellsPalsy.cfm. Accessed Nov. 10, 2009.
- Bell's palsy. The Merck Manuals: The Merck Manual for Healthcare Professionals. http://www.merck.com/mmpe/sec16/ch219/ch219i.html. Accessed Nov. 11, 2009.
- Cardoso JR, et al. Effects of exercises on Bell's palsy: Systematic review of randomized controlled trials. Ontology & Neurotology. 2008;29:557.
- De Almeida JR, et al. Combined corticosteroid and antiviral treatment for Bell palsy: A systematic review and meta-analysis. Journal of the American Medical Association. 2009;302:985.
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