Fasciculation
| Fasciculation | |
|---|---|
| Other names | Muscle twitch |
| Animated image showing involuntary twitching in the upper eyelid of a young adult male | |
| Pronunciation |
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| Specialty | Neurology |
A fasciculation, or muscle twitch, is a spontaneous, involuntary muscle contraction and relaxation, involving fine muscle fibers. They are common, with as many as 70% of people experiencing them. They can be benign, or associated with more serious conditions. When no cause or pathology is identified, they are diagnosed as benign fasciculation syndrome.