Myoclonus is a sudden and involuntary muscle spasm. It is usually a symptom of an underlying disorder and can interfere with eating, talking, and walking. The movement is involuntary and can’t be ...

Background A 20-year-old woman presented to a specialist epilepsy center with a 3-year history of drug-resistant epileptic seizures, progressive myoclonus, ataxia, and cognitive decline.

Myoclonus is a sudden, random muscle jerk. It can happen alone or stem from a medical condition. Possible causes include medication side effects, damage to the nervous system, and disorders that ...