(Bell’s palsy is caused by a lower motor neuron lesion of the seventh cranial nerve that may result from infection, trauma, hemorrhage, meningitis, or tumor.)
Bell’s palsy affects all age-groups, but occurs most commonly in patients under age 60. Onset is rapid and, in 80% to 90% of all patients, it subsides spontaneously, with complete recovery in 1 to 8 weeks. Recovery can take longer in elderly patients. If patients experience only partial recovery, contractures may develop on the paralyzed side of the face. Bell’s palsy may recur on the same or opposite side of the face.
What causes Bell’s palsy Bell’s palsy can be caused by: • Infection • Hemorrhage • Tumor • Meningitis • Local traumatic injury.