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Bell's palsy is a condition that causes temporary weakness or paralysis of the muscles in one side of the face. It is the most common cause of Facial Paralysis.
It usually results from a dysfunction of the cranial nerve VII (the facial nerve) causing paralysis of one side of the face. The very peculiar feature of this condition is a rapid onset of partial or complete paralysis that often occurs overnight. It is named after Scottish Anatomist Charles Bell (1774-1842) who first described this condition and hence the name – Bell’s Palsy.