![]() Such movements can include simple tasks such as pouring a drink, drinking from a cup, using utensils, tying shoelaces, drawing, or writing. In most cases, tremor occurs when individuals attempt to make voluntary movements (kinetic tremor). It can also be aggravated by stress, fever, fatigue, a heightened emotional state, low blood sugar, and caffeine.ĭifferent tremor types can be associated with ET. Tremor in individuals with ET usually begins gradually, slowly worsening as an affected individual ages. Recent studies have demonstrated that the average rate of progression of arm tremor severity is approximately 1.5 to 5% per year.Ī tremor can be fast or slow and its breadth of range or degree (amplitude) can be dramatic and easily noticeable or so mild as to be nearly imperceptible. Although generally progressive, the rate of progression is slow on average. In many cases, tremor affecting the hands or arms can slowly progress to affect other areas, most often the head. Tremor can also affect the head (i.e., neck), voice, jaw, or tongue. Usually, both of the hands or arms are affected, although one side of the body is generally affected more than the other. In some cases, tremor of the hands or arms occurs as an isolated finding. The characteristic symptom of ET is tremor, which most often occurs as involuntary shaking or trembling of the hands and/or arms. Age of onset, progression, tremor distribution, and severity can vary greatly from one individual to another. Some researchers now believe that ET may actually represent a group of similar, yet distinct, diseases sharing the common trait of kinetic tremor.ĮT is a highly variable disorder. In addition, researchers have determined that additional motor and non-motor symptoms can be associated with the disorder. Consequently, the term benign was dropped from the name. However, ET can be associated with a variety of psychosocial issues and it can potentially significantly disrupt daily activities and social interactions. Traditionally, ET was viewed as a relatively benign disorder characterized by one symptom, tremor. The causes of ET are most likely many, which means that several factors, such as genetic and environmental ones, may each play a role in the development of the disorder. In some cases, the disorder runs in families in others, it occurs in individuals with no previous family history. ![]() The exact, underlying cause of ET is not fully understood. In some cases, affected individuals may also develop a variety of non-motor symptoms including cognitive impairment, depression or anxiety. In individuals with ET, other motor symptoms may be present including an unsteady manner of walking due to an inability to coordinate voluntary movements (ataxia). Tremor may be seen as involuntary shaking or trembling of the affected area. A tremor is an involuntary, rhythmic, movement of a body part.
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