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Dysautonomia (or autonomic dysfunction, autonomic neuropathy) is an umbrella term for various conditions in which the autonomic nervous system (ANS) does not work correctly. Dysautonomia is a type of neuropathy affecting the nerves that carry information from the brain and spinal cord to the heart, bladder, intestines, sweat glands, pupils, and blood vessels. Dysautonomia may be experienced in a number of ways, depending on the organ system involved, for example difficulty adapting to changes in posture, or digestive symptoms. The diagnosis is achieved through functional testing of the autonomic nervous system, focusing on the organ system affected. Investigations may be performed to identify underlying disease processes that may have led to the autonomic neuropathy that is causing the dysautonomia. Symptomatic treatment is available for many symptoms associated with autonomic neuropathy, and some disease processes can be treated directly. ==Signs and symptoms== The symptoms of dysautonomia are numerous and vary widely from person to person depending on the nerves affected and underlying cause. Symptoms often develop gradually over years. Each patient with dysautonomia is different—some are affected only mildly, while others are often left disabled. The primary symptoms present in patients with dysautonomia include: *Excessive fatigue *Excessive thirst (polydipsia) *Lightheadedness or dizziness, often associated with orthostatic hypotension (abnormally low blood pressure on standing), sometimes resulting in syncope (fainting) *Rapid heart rate or slow heart rate *Blood pressure fluctuations *Difficulty with breathing or swallowing *Shortness of breath with activity or exercise *Distension of the abdomen *Mydriasis (abnormal dilation of the pupils) leading to blurry vision *Urinary incontinence or neurogenic bladder dysfunction *Gastroparesis (delayed gastric emptying) with associated nausea, acid reflux and vomiting *Constipation *Excessive sweating or lack of sweating (anhydrosis) *Heat intolerance brought on with activity and exercise *Sexual problems including erectile dysfunction in men and vaginal dryness and orgasmic difficulties in women 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dysautonomia」の詳細全文を読む スポンサード リンク
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