I had the pain issue after the 1210 shot, big time, and still have it, but I had injured my shoulder previously (many yrs ago), so in my case it was a re-injury. Gets some better then gets sore again but it had been basically healed before the shot, and has been painful since. I've gotten them in my butt for 2011 and 2012. Highly recommended. Hope everyone's heals eventually!