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Once known as familial tremor, benign tremor or hereditary tremor, essential tremor (ET) is a neurological condition that causes a rhythmic trembling of the hands, head, voice, legs or trunk.nce known as familial tremor, benign tremor or hereditary tremor, essential tremor (ET) is a neurological condition that causes a rhythmic trembling of the hands, head, voice, legs or trunk.
1 Description: Also known as familial tremor, benign essential tremor, or hereditary tremor, ET is a progressive neurological condition that causes a rhythmic trembling of the hands, typically upon voluntary movement, head, voice, legs, or trunk.2  It is not caused by loss of dopamine.ssential Tremor Movement Disorder. 1  Description: Also known as familial tremor, benign essential tremor, or hereditary tremor, ET is a progressive neurological condition that causes a rhythmic trembling of the hands, typically upon voluntary movement, head, voice, legs, or trunk. 2  It is not caused by loss of dopamine.