Bell's Palsy is a weakness or paralysis of the facial muscles from damage or trauma to the facial nerves.
In most cases, the cause is unknown. But it may be related to inflammation of the nerve, diabetes, pregnancy, Lyme disease, or viral infections, such as herpes or varicella. Symptoms usually appear only on one side of the face. They may include:
- Inability to close the eyelid
- Tearing of the eye
- Facial drooping
- Drooling
- Pain in the jaw or behind the ear
- Changes in taste
- Sound sensitivity
- Facial twitching
- Headache
- Trouble eating or drinking
- Problems speaking
Damage to the eye can be a serious problem. The inability to blink can cause the eye to dry out. An ulcer (sore) can then form on the cornea. Also, not blinking means that the eye has no protection from dirt and dust particles.
Treatment involves protecting and moistening the eye. Medicines, such as steroids, may also help.
How long it takes to recover depends on how severe the nerve damage is. Most people begin to get better within a few weeks. They recover fully within 3 to 6 months. In rare cases, some people have weakness that doesn't go away. Sometimes the condition returns months or years later.