Orthostatic hypertension—a rise in blood pressure upon assuming upright posture—is an underappreciated and understudied clinical phenomenon. There is currently no widely agreed-upon definition of clinical orthostatic hypertension, the current definitions being operational within the context of particular studies. The underlying pathophysiology is thought to involve activation of the sympathetic nervous system, but the actual etiology is poorly understood.
Source : Nature Clinical Practice Nephrology volume 2, pages 424–431
It's estimated that around 1% of the world population is affected to some degree. There are currently no officially recommended treatments.
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