Facial paralysis is a loss of facial movement which may be related to a viral infection of the facial nerve or caused by stroke which is a more severe condition that involves damage of brain cells. Some other causes may be head tumor, middle ear infection, Ramsay-Hunt Syndrome, some autoimmune diseases such as multiple sclerosis and injury to the face.
Among all, Bell’s Palsy, also known as acute peripheral facial palsy of unknown cause, is the most common diagnosis of facial paralysis which usually includes a combination of symptoms:
facial droop and difficulty in closing eyes and smiling on the affected side
difficulty in eating, drinking and speaking clearly
altered sense of taste
hypersensitivity to sound
pain behind ears, around jaws, and headache
decrease in tearing and saliva production