Hello everyone, I have not posted before. I believe I may have POTS but I have not been diagnosed. I have been diagnosed though with sinus tachycardia and have been taking beta blockers for this. I have fairly thick hair but I have had some noticable thinning at my temples that started with my first pregnancy, when I started taking beta blockers it grew back. I am on a break from medication for a couple of months to see how my system is going, and my hair has fallen out again. Weird huh?