Benign essential tremor
An action tremor without features of parkinsonism.
Often inherited as an autosomal dominant trait. It tends to present in the teens or in the elderly and affects males and females equally.
A symmetrical, flexion-extension tremor, affecting the hands and head in particular, and sometimes the voice. Oscillations are not usually present at rest, but occur posturally, e.g. holding a newspaper, and are increased by anxiety and movement.
Treatment is often unnecessary, small doses of a β adrenergic blocker such as propranolol or primidone often reduce the tremor. The condition is slowly progressive and may cause some disability.