Postural Orthostatic Tachycardia Syndrome (POTS) is a complex and often misunderstood condition that affects the autonomic nervous system, primarily characterised by a significant increase in heart rate upon standing.
https://drcynthia.com/why-pots-is-often-misdiagnosed-and-how-to-advocate-for-yourself/
Why POTS Is Often Misdiagnosed—and How to Advocate for Yourself