Myoclonus is a sudden, involuntary muscle jerk or spasm that can occur in various parts of the body. It can happen as a single event or in a series of jerks and may be caused by factors such as epilepsy, nervous system disorders, or even medications. This condition can affect people of all ages and may vary in severity. While myoclonus itself is not a disease, it can be a symptom of underlying issues, such as Parkinson's disease or multiple sclerosis. Treatment often focuses on managing the underlying cause and may include medications or lifestyle changes.