Clonus is a neurological condition that creates involuntary muscle contractions. This results in uncontrollable, rhythmic, shaking movements. It’s usually brought on by excessive muscle stretching.

Medically reviewed by Brigid Dwyer, MD Key Takeaways Clonus causes involuntary, rhythmic muscle contractions when a muscle is stretched.It is often observed in conditions like multiple sclerosis, ...

Clonus, or the clonus reflex, is a neurological condition that results from damage to the nerve cells that control muscles. It can cause involuntary contractions, spasms, pulsing, tightness, and pain ...