Tremor

For the film see Tremors (film). For other uses, see Tremor (disambiguation). Tremor is defined as the involuntary, spasmodic movement of a body part, or parts. This occurs through the contraction of opposing muscle groups. Alternatively, tremors are a continuous quivering of the body, especially in a rhythmic or convulsive manner. Tremor may occur as an isolated symptom and usually of idiopathic (unknown) cause (essential tremor) or a part of the symptom constellation of another disorder ...