Many reasons: Presumably you've seen a neurologist to rule out epilepsy or a brain tumor? Myoclonic jerks can be due to anxiety, head or spinal cord injuries, kidney or liver failure, chemical or drug poisoning, hypoxia, genetic condition, or other neurological condition. See your physician for evaluation if the symptoms worsen or become more frequent. http://www.medscape.com/viewarticle/736674
Answered 12/23/2014
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