====== Hemifacial spasm ======

//Hemifacial spasms// are a neurological condition which leads to short, irregular involuntary contractions of the muscles on one side of the face. The condition was first medically described in the late 19th century.

The twitches typically first appear with one of the eyelids, and can progress from there to the rest of the face (one side only).

It occasionally has an obvious cause such as a facial nerve injury or a tumour, but usually there is no known causative factor.

There are several theories regarding possible mechanisms of the disorder - but none is generally accepted - see [[https://en.wikipedia.org/wiki/Hemifacial_spasm#Causes|Wikipedia]]

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Also see [[content:medicine:diseases:a-f:bfs]] which, when affecting the face, typically only affects one side.