Dear all in this old threat: You are getting the causation wrong. As somebody who had access to academic medical databases when trying to figure out what was wrong with me (=POTS), the point I've understood about POTS is that it is linked to hypermobility of joints & cartilage weakness. That is, hiatus hernia is a symptom of the underlying disorder that can cause POTS, which is seen in the weakness of the constrictive function of blood vessels (causing the inability to keep up blood pressure and the need for the heart to beat faster) as well as other symptoms of POTS like incontinence and constipation/gastroparesis. Obviously vomiting related to POTS can also increase the chances of getting a hiatus hernia. But it's not hiatus hernia causing POTS, because POTS would then go away with surgery of the hiatus hernia.
