Blepharospasm, on the other hand, can sometimes be genetic, and less commonly, is secondarily caused by a central nervous system disorder like M.S., autoimmune diseases, Huntington’s disease, or ...

A muscle spasm — also known as a charley horse, muscle cramp or twitch — is a sudden, involuntary movement in one or more muscles. Common causes include stress, exercise, or dehydration, but nerve ...