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Essential tremor is a condition that causes involuntary shaking. While it usually develops in middle age, it can start much earlier. Shari Finsilver was aware of her hands shaking as a child. When I was about 11 years old, I noticed in art class that I was never able to draw a straight line, she says.
Back to Top Causes. Tremors occur when there is a problem with the nerves supplying certain muscles. They may affect the whole body or just certain areas, such as your hand. Familial tremor is a lot like essential tremor, except that the shaking affects more than one person in a family.