If you mean Bell palsy (or Bell's--the apostrophy-s is the older form), is not the same as Lou Gehrig disease, although both are related to the nervous system.
Bell palsy usually affects one side of the face, and sometimes people have it and then get over it.
Lou Gehrig disease, also known as ALS or amyotrophic lateral sclerosis, affects muscles all over the body, and there is no known cure.
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