[Tremor].

Tremor is defined as an involuntary, rhythmic oscillatory movement of a body part. Based on clinical symptoms, tremors are classified into rest, postural, simple kinetic, intention, and task-specific tremors. Pathological conditions associated with tremors include Parkinson's disease, essential tremor, cerebellar tremor, task-specific focal dystonia, peripheral neuropathy induced tremors, tremor secondary to poisoning/drugs, and physiological tremor. In this article, we discuss classifications and tremor etiologies, as well as diagnosis and treatments including surgical management.