Hemifacial spasm (HFS) is a neurological disorder manifested by twitching on one side of the face due to involuntary contractions of the eyelid and other facial muscles. It usually begins gradually ...

With hemifacial spasms, a neuromuscular disorder, an eyelid spasm progresses to incorporate the brow and muscles in the lower face, often pulling the mouth to one side. Eyelid spasms differ from ...