A strong family history. Mother or father, aunts or uncles, grandmothers and grandfathers, grand aunts and grand uncles. Children, nephews and nieces. The trembling in ET has a different relationship to the electrical activity of the involved muscles than the trembling in PD or the trembling in physiological tremor. Physiological trembling refers to the intrinsic or inherent trembling present in all of us, the trembling which manifests itself during anxiety and stress.
Physiological tremor has a different relationship to muscular activation.
Response to drugs. The trembling of ET may be temporarily suppressed by alcohol. Prevalence Estimates regarding ET s prevalence vary. The prevalence of ET increases with age. A study that surveys people in a retirement community will come to a different conclusion from one that surveys people in a college town.