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Essential tremor (ET, also referred to as benign tremor, familial tremor, or idiopathic tremor) is the most common movement disorder; its cause is unknown.
What Is It? Tremor is the shaky movements of your hands, limbs, head or voice that you can't control. Sometimes tremor is a normal reaction to a situation such as fear, fatigue or anger. It also can be a side effect of too much caffeine, a medication, or withdrawal from a drug or medicine.