Fasciculation

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Fasciculation
Other names	Muscle twitch
Animated image showing involuntary twitching in the upper eyelid of a young adult male
Pronunciation	/fəˌsɪkjʊˈleɪʃən/
Specialty	Neurology

A fasciculation, or muscle twitch, is a spontaneous, involuntary muscle contraction and relaxation, involving fine muscle fibers.^[1] They are common, with as many as 70% of people experiencing them.^[1] They can be benign, or associated with more serious conditions.^[1] When no cause or pathology is identified, they are diagnosed as benign fasciculation syndrome.^[1]