Essential Tremor. The History of Essential Tremor. Epidemiology and Etiology of Essential Tremor. Pathophysiology of Essential Tremor. Animal Models of Essential Tremor. Neuropathology and Neurochemistry of Essential Tremor. Differential Diagnosis and Clinical Characteristics of Essential Tremor. Clinical Assessments of Essential Tremor. Impact of Essential Tremor and Its Medical and Surgical Treatment on Neuropsychological Functioning, and Quality of Life. Neuroimaging of Essential Tremor. Medical Treatment of Essential Tremor. Surgical Treatment of Essential Tremor. Occupational Therapy, Physical Therapy, and Alternative Therapies for Essential Tremor. Parkinsonian Tremor. Dystonic Tremor. Cerebellar Tremor. Holmes Tremor. Orthostatic Tremor. Task-Specific Tremor. Neuropathic Tremor. Posttraumatic Tremor. Infectious Tremor. Intracranial Lesions and Tremor. Drug- and Toxin-Induced Tremor. Physiological Tremor. Psychogenic Tremor