‌Hemifacial spasm is a disorder of the nerves and muscles that causes nonpainful involuntary twitching on one side of the face. Many people refer to hemifacial spasms as lip muscle spasms. Hemifacial ...

Share on Pinterest Electrical impulses in the brain can sometimes cause random spasms, which may result in a temporary eyelid twitch. Sometimes, electrical activity in the brain causes nerve cells to ...