Tremor of the arms was present during voluntary movements. It was also present while walking yet disappeared during sleep. Head tremor was present. Neither parents nor siblings had tremor; hence, the tremor did not seem to be familial. [ncbi.nlm.nih.gov]

• Action Tremor

  Paralysis agitans, MS, and tremor secondary to toxic exposure were judged unlikely. The case was considered to be an idiopathic action tremor. [ncbi.nlm.nih.gov]