Hello, I was wondering if you can give me some insight on why I faint. Every since I can remember, whenever I am over heated I faint. If I am in a long line, on the bus, in the kitchen cooking, taking a hot shower, or even if I hit my knee I would faint. As of today, doctors say I do not have high blood pressure, but it runs in my family, so I do not take any meds for that. I know I need to lose weight though.