If the standard for diagnosis is postural tachycardia, i.e. tachycardia on standing, then how come everyone wasn't diagnosed with inappropriate sinus tachycardia or orthostatic intolerance? Pots is more recognized in a clinical setting now, but orthostatic intolerance is not so new. So if we did always have pots, why wasn't it recognized, including by us? The explanation should be, my heart races when I stand and I feel like I am going to pass out." That is not something a clinician would typically ignore as it is a marker for oi. At least a cardiology referral would take place. For me, i was exhibiting symptoms before 2007 and they couldn't find anything--had a lot of poor man tilts with no symptoms-- but it wasn't until 2007 to present that the heart rates became fast.