POTS falls under the more general umbrella of disorders called dysautonomia. POTS, like all dysautonomias, is characterized by dysfunction of the autonomic nervous system which controls many “automatic” physiological functions including blood pressure, heart rate, blood vessel and pupil diameter, movements of the digestive tract, and body temperature. In dysautonomia, the person can suffer from a wide range of symptoms that are ultimately connected by the dysfunction of the autonomic nervous system.
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