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Dystonia
Dystonia is a neurological movement disorder in which sustained muscle contractions cause twisting and repetitive movements or abnormal postures.〔(Dystonia fact sheet: National Institute of Neurological Disorders and Stroke )〕 The movements may resemble a tremor. Dystonia is often initiated or worsened by voluntary movements, and symptoms may “overflow” into adjacent muscles.
The disorder may be hereditary or caused by other factors such as birth-related or other physical trauma, infection, poisoning (e.g., lead poisoning) or reaction to pharmaceutical drugs, particularly neuroleptics.〔 Treatment must be highly customized to the needs of the individual and may include oral medications, botulinum neurotoxin injections, physical therapy and/or other supportive therapies, and/or surgical procedures such as deep brain stimulation.
==Classification==
There are multiple types of dystonia, and numerous diseases and conditions may cause dystonia.
Dystonia is classified by: 1. Clinical characteristics such as age of onset, body distribution, nature of the symptoms, and associated features such as additional movement disorders or neurological symptoms, and 2. Cause (which includes changes or damage to the nervous system and inheritance).〔 Physicians use these classifications to guide diagnosis and treatment.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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