@halcyon Originally it was thought with POTS that one had to have OH (orthostatic hypotension) too. They clearly are just defining it there to make it clear there that POTS isnt defined etc by having OH with it. In fact now if you have the OH with it as many do, you now get given two different diagnoses. One of POTS and one of orthostatic hypotension.
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Lots of us here including myself have orthostatic hypertension. It's one of the 5 different kinds of dysautonomia that ME expert Dr David Bell says happens with ME. A ME person may have just one of these kinds to being like myself and having ALL of these so its quite possible to have both orthostatic hypertension and orthostatic hypotension (both when standing I can have 197/136 at one minute of standing or go to 40/0 (that's a lay NOW reading for me) with my BP readings. I never know what my BP and heart is going to do when I stand.
So be aware though orthostatic hypertension has been found for you, it is very possible you could also have other of the dysautonomia types too.
Im on clonidine for the orthostatic hypertension part of my POTS. Clonidine works differently to other high BP drugs as it works by helping keep the noradrenaline down which causes the BP spike in this kind of issue.
there has been a very good scientific article on this kind of POTS (if Im remembering correctly it was in some Indian Journal). Note this kind of POTS, when those who have this were studied, they found they were extremely likely to have a mast cell disorder (it was over 80% ..I cant remember how many now but it was extremely high, of those who have it have been found to have a mast cell disorder).