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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.
Summary. Hereditary essential tremor (ET) is an inherited movement disorder characterized by intentional involuntary tremor, mainly of the hands. ET is the most frequent movement disorder with a prevalence of 2-4% and 80% of cases are thought to be hereditary ET (HET).ereditary essential tremor (ET) is an inherited movement disorder characterized by intentional involuntary tremor, mainly of the hands.