I've found that the shot itself varies from barely feeling it at all, to a slight sting, maybe a 2-3. In fact, the first time I did a shot, I couldn't quite believe that the needle was in my thigh, even though I could see it plain as day. 😀 The muscle pain the next couple days has occasionally gotten up to maybe a 6 or 7 when I squat down to pick something up (which I do a lot of at work.) At its worst, it's like when you really over-do a workout and it hurts to move the affected muscle. Usually, though, it just feels slightly bruised, and I don't even notice unless I get into an awkward position. Interestingly enough, I find that the more it hurts at the moment of injection, the less it hurts over the next couple of days. I have no idea why.