Table 2.

Combination of different activation conditions of tremor syndromes

Type of tremor	Rest	Posture	Action
Physiological		+ +	+
ET	−	+ +	+
ET plus	+	+ +	+
PD	+ +	+	+/−
Drug-induced	+	+ +	+
Endocrine/metabolic		+ +	+
Dystonic	+/−	+ +	+
Orthostatic		+ +
Neuropathic		+ +	+
Holmes	+ +	+ +	+ +
Cerebellar		+/−	+ +
Psychogenic		+	+

+ +, typically present; +, may be present; +/−, occasionally present. ET: essential tremor; PD: Parkinson’s disease