The sudden onset of paralysis of the muscles of one side of the face. The cause is unknown, but the paralysis is presumed to be due to swelling of the facial nerve as it emerges through the skull. Bell's palsy is usually painless, but it may cause severe embarrassment, loss of confidence, and withdrawal because of uncontrollable dribbling and weeping from the affected side, difficulties in speaking and eating, and loss of control of facial expression. There is no specific treatment, but the use of anti-inflammatory medication will help to prevent further swelling of the nerve (and further paralysis), and physiotherapy will help to keep the paralysed muscles in good condition. Recovery is usually spontaneous but can take from a few weeks when paralysis is partial, to many months when paralysis is extensive.
It sometimes occur on pregnant women and those who are under stress. It affects the eye on the affected area.