According to the DINET website, there are a lot of underlying causes. I think some of your answer lies with who gets POTS mostly and the causes for them, but PNS/Carcinoid, Parkinsons, MS, Amyloidosis, IBD, Crohns, Celiac, etc are all identifiable and to some extent treatable, although some have no positive outcome. I would bet for a lot of males, especially those over 50, the reasons for POTS maybe different and therefore the treatment different.