Anonymous wrote:From my personal experience, and that of my son, the problem is (hoorah!) low blood pressure, which is normal at that age. From about 18 to 26, I would often feel dizzy when I abruptly stood up. Doctors said "be happy - this is great and accomodate! (i.e., don't jump up and expect to run immediately)". My DS has it also and almost always passes out for blood draws.