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Postural Orthostatic Tachycardia is a syndrome. As such, there is a collection of symptoms that distinguish it. The symptoms are widespread because the autonomic nervous system plays an extensive role in regulating functions throughout the body. Many of these symptoms, such as low blood pressure,* may present only after prolonged standing. Symptoms will vary from person to person. The following is a list of symptoms reported by patients. When possible, we have included the percentage of patients that research reports have experienced a given symptom. Symptoms presumed to be related to c