Facial nerve paralysis: it is always Bell's palsy?

Most patients with facial nerve paralysis have idiopathic, or Bell's palsy. Nevertheless, other more serious causes should be carefully excluded before Bell's palsy is diagnosed. Several tests can help the physician determine the site of the lesion and the physiologic extent of involvement of the facial nerve. The type of treatment depends on the cause of the paralysis and whether it is complete or partial. Familiarity with facial nerve anatomy and the various causes of facial paralysis should facilitate early diagnosis and appropriate treatment.