TREMOR definition: 1. a slight shaking movement in a person's body, especially because of nervousness or excitement…. Learn more. A tremor is an involuntary, somewhat rhythmic muscle contraction and relaxation involving oscillations or twitching movements of one or more body parts. It is the most common of all involuntary movements and can affect the hands, arms, eyes, face, head, vocal folds, trunk, and legs. Most tremors occur in the hands. In some people, a tremor is a symptom of another neurological disorder. विकिपीडिया पर " Tremor " भी देखें। A tremor is an involuntary, rhythmic, shaking movement of part of the body, such as the hands, head, vocal cords, trunk, or legs. Tremors occur when muscles repeatedly contract and relax. Tremor is a neurological condition that causes shaking or trembling movements in one or more parts of the body. Learn about the different types of tremor, such as essential tremor, Parkinsonian tremor, and orthostatic tremor, and how they are diagnosed and treated.