OphthalmologistTo help identify other health problems that may be causing the symptoms of Bell's palsy, such as infections or diabetes, sometimes blood tests will be ordered. In diagnosing Bell's palsy, magnetic resonance imaging (MRI) or computed tomography (CT) scans of the face can help your doctor find out if there are other sources of pressure on the facial nerve.  Another test called electromyography (EMG) can show if there has been damage to the facial nerves and, if so, how severe the damage is.

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