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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.
One sibling could have a hand tremor and the other sibling might have a voice and head tremor, says Lewitt. It's often confused or even misdiagnosed as Parkinson's disease. But with essential tremor the shaking usually occurs when the person is doing an activity, like writing or lifting a spoon. People with Parkinson's shake when their hands are at rest. The other major difference is essential tremor does not typically worsen or progress to complete disability, like Parkinson's disease.