Is (physical) pain a necessary precursor to effective healing? Does your body/brain need the pain signal to speed up healing process, like an "urgent" signal? For instance, if your leg is cut, but you never feel the discomfort, would your body not rush to heal it as much as if there was a searing pain going through your leg? So if there's no pain, would your body not know it is supposed to fix something? Would there be, as they say, no gain without the pain?

If so, then does that mean all those pain relievers are actually slowing down the healing process? And the relievers then become a semi-tradeoff between comfort and progress.