Just stumbled on your post. I have this same problem. My doctor told me it was because I have low blood pressure. When you get in the shower, or any place warm, your blood pressure gets even lower (I guess that's why a hot bath is relaxing). I have to wear a Holter Monitor next week and then I'll hopefully get some treatment. Good luck!
Hot water causes blood vessels to dilate (expand), but your total blood volume has stayed the same. There is the same amount of blood in more space, so blood pressure against the walls of your arteries drops. Your body (heart) "thinks" there is a problem, and begins beating faster to move the blood to essential organs, such as the brain. If it can't compensate enough, you will pass out, making it easier for your blood to circulate in a lying down position, instead of trying to work "against" gravity while standing.
The fancy term for this is orthostatic hypotension.Hope you feel better soon!
Source(s): I am an RN
Hey, about the shower thing, just happen to me, been since i was around 13 also, now i am 20, Ive tried to learn what causes it, I think it eat a salty thing b4 and drink sugar drink b4 helps, also "pooping" lol, im not joking. make sure your insides are cleaned and you have sugar. its been wokring for me, but one time it didnt, which right when i started feeling that way, my mother brought me juice, which helped me alot. hope that helps. <3
I just wanted to let you know that the almost fainting in the shower thing sometimes happens to me too. It resently happened halfway through the day. After that a threw up so I don't know if it was just somthing that happen before that, but wow it was creepy. It is an awful feeling. I'm not sure why it happens but it is sometimes quite scary. Just thought I would let you know and I'm glad I found your post so I know I'm not alone. ^_^ Thanks
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