In some cases, the disorder is presumed to be associated with inflammation of the facial nerve where it travels through the bones of the skull. It may also be caused by head injury , tumor , hypertension , or infarction. Seventy-five percent of cases are preceded by upper respiratory infection . Signs And Tests Examination shows upper and lower facial weakness , which is almost always isolated to one side of the face or occasionally to the forehead, eyelid, or mouth. Despite subjective sensory symptoms, the loss of sensation on examination is a rare and disturbing finding.
Blood pressure is normal.
In many cases, no treatment is necessary. The goal of treatment is to relieve the symptoms. Corticosteroids may reduce swelling and relieve pressure on the facial nerve for some persons. Lubricating eye drops or eye ointments may be recommended to protect the eye if it cannot be closed completely. The eye may need to be patched during sleep to protect it.