Myoclonus is involuntary movements, fast jerky contractions of individual muscles or their groups. The musculature of the limbs, trunk, or face is usually involved without loss of consciousness. Myoclonus are physiological or pathological, the development of which is associated with epilepsy, degenerative and infectious diseases, metabolic-hypoxic disorders. Diagnosis is carried out by clinical, laboratory and instrumental methods (MRI, EEG). Treatment involves the elimination of reversible conditions and supportive care.