i can't tell you exactly since i have no way of examining you but i can say that when you sit or are nearly immersed in very hot water the blood tends to pool in those areas that are under the water. subsequently when you stand blood may rush to the areas of heat and warmth and be shunted from the brain and cause you to be dizzy or even faint. remember to drink fluids get up and move very slowly and purposefully.
after about 20 minuts in my jacuzzi i became light headed and somewhat dizzy. what is causing this?