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| | Essential Tremor Information on Healthline |
 | | Tremor is derived from the Latin "to shake." It is an involuntary, rhythmic, back and forth oscillation or shaking of a part of the body, resulting from alternating or irregularly synchronous contractions of antagonist muscles. |
 | | It is a syndrome characterized by a slowly progressive postural and/or kinetic tremor of certain body parts, most commonly the arms, hands, and head when the respective body part is maintained in a constant position. |
 | | Tremor amplitude worsens with emotion, cold, hunger, and fatigue, and tends to increase with age. |
| www.healthline.com /galecontent/essential-tremor (1008 words) |
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