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. Many of the other factors associated with this disorder are not readily preventable. Seventy-five percent of cases are preceded by upper respiratory infection . 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.