A sore arm? I have read reports of people getting the vaccine here saying it hurt less than other shots. I think part of it depends on the person doing it and also how your veins are. I have awesome veins and they are easy to shoot and I generally feel little when needles go in when it is a good nurse. The less effective nurse will end up bruising you up. Not painful though. I tend to deal with pain very easily though. The kind of person who could cut off a finger joint and not flinch. A bit Lector like at times. Others with more flab and deeper veins probably have a harder time as you have to locate the rotters. I would be a brilliant junky.