Myoclonic seizures affect a small number of children and adults with
epilepsy of unknown cause (idiopathic). In children
and teens with
juvenile myoclonic epilepsy, the seizures seem to
occur most often after waking up or while falling asleep.
During a myoclonic seizure:
The arms, legs, torso, or facial muscles jerk
rapidly as though they are being shocked.
The body may jerk once or
many times, on one or both sides of the body, in a rhythmic or random
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