Myoclonus can occur as a result of numerous medical conditions, including a head or spinal cord injury, metabolic disease, liver or kidney failure, autoimmune inflammatory disease, drug or chemical poisoning, infection, lipid storage disease, and reactions to medication. Nervous system disorders can also result in secondary myoclonus. Stroke, Creutzfeldt-Jakob disease, Lewy body dementia, Parkinson's disease, Alzheimer's disease, frontotemporal dementia, Huntington's disease, corticobasal degeneration, brain tumor, multiple sclerosis, stiff-person syndrome, and multiple system atrophy can all cause secondary myoclonus.

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