What’s the deal with all this tachycardia/syncope/POTS stuff in young women?

I swear I am seeing this new trend of women ages 16-30 who are having multiple syncope episodes, legitimate tachycardia with standing, and all sorts of weird symptoms. I never see older women with these issues. Just younger women. Do we think there’s an anxiety component? Honestly I’m baffled by this trend and don’t know how to explain it. Anyone seeing similar stuff?