system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it we can use anesthesia to block out pain receptors, but we don’t use a form of anesthesia to help with after work out pain?
gpt
As with nearly everything, there is a cost and a benefit and in this case, it isn't a dollar cost but the cost in terms of potential side effects. 

Even OTC pain killers have side effects and overuse makes it worse. So if there is only temporary benefits but potentially bad side effects, generally medication is not recommended.

The kind of anesthesia used in hospitals, by the way, are really strong medications and cannot be used without supervision by medical professionals. It is unlikely that for a relatively minor situation like muscle aches after a workout that it would be recommended.