Medically reviewed by Brigid Dwyer, MD Key Takeaways Involuntary muscle movements happen when your body moves without you intending it, like with tics or tremors.  The causes of involuntary movements ...

Muscle twitching is an experience of sudden involuntary repetitive muscle contraction and relaxation, usually visible under the skin. Twitching of a muscle is called fasciculation. In addition, some ...