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There are several different types of tremor, including essential tremor, drug-induced tremor, Parkinson's tremor, and tremor due to other conditions such as neuropathy (nerve pain), stroke, liver failure, multiple sclerosis, and high levels of thyroid hormone.
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.