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If there is not enough blood flow to the brain, a person may feel lightheaded or pass out every time they stand. In POTS, the autonomic nervous system doesn't work in the usual way, so the blood vessels don't tighten enough to make sure there is enough blood flow to the brain.
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The content is intended to augment, not replace, information provided by your clinician. It is not intended nor implied to be a substitute for professional medical advice. Reading this information does not create or replace a doctor-patient relationship or consultation. If required, please contact your doctor or other health care provider to assist you to interpret any of this information, or in applying the information to your individual needs.