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Many people associate shaky hands with Parkinsonâs disease, but the most common cause of shaking hands is actually essential tremor. Essential tremor is the most common neurologic disorder affecting adults, but itâs not well understood.
Tremors are caused by problems with the nerves supplying certain muscles. They may affect the whole body or just certain areas, as with hand tremor. Types of tremors include: 1  Drug-induced tremor (tremors caused by certain drugs). 2  Essential tremor (no known cause). 3  Familial tremor (runs in families).