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Myokymia
Classification and external resources
DiseasesDB 31530
eMedicine neuro/235
MeSH D020385

Myokymia, is an involuntary, spontaneous, localized quivering of a few muscles bundles within a muscle, but which are insufficient to move a joint. One type is superior oblique myokymia.

Commonly referred to when describing an involuntary eyelid muscle contraction, typically involving the lower eyelid, less often the upper eyelid. It occurs in normal individuals; starting and disappears spontaneously. It can sometimes last up to three weeks. Frequent contributing factors include too much caffeine, high levels of anxiety, fatigue, stress, overwork, and a lack of sleep. Usage of certain drugs and alcohol may also be involved.

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