Needles and bruises!!

Why is it that every time they try to take blood or put an IV in that they end up having to poke me over and over again. I am NOT a human pin cushion. I now have a HUGE black bruise around my wrist, thumb and up both my arms. I look like a drug user. 3 needles and 4 IV's is not my idea of a good time. OK I am done venting now.....Well maybe.......