I've always had low blood pressure. Whenever I go to hospital and they test it they say, "oh you have low blood pressure" and I say yes always have. In fact the last time I had IVIG, it was below the normal range of the machine, which alamed, but the nurse said it was ok. I also seem to have a high heart rate to go with this, but no one seems to worried about it, so I'm guessing I shouldn't either.