ELI5- why is there “good” pain (like rubbing a sore muscle), and “bad” pain? Why do they feel different?

Question

ELI5- why is there “good” pain (like rubbing a sore muscle), and “bad” pain? Why do they feel different?

In: Biology

Answer 1

Acetylcholine and dopamine are involved and released in “pleasure pain.” (Massages et al.) But I can’t ELI5 it.