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Bell’s palsy

Paralysis of one of the facial nerves (the nerves that supply muscles on the face), due to unknown cause. It is characterized by an asymmetric facial expression, due to the paralysis of one side. Several conditions can cause a facial paralysis, e.g., viral infections, brain tumor, stroke, and Lyme disease. However, if no specific cause can be identified, the condition is known as Bell’s palsy.