Pain, itch and endorphins.
D004723:Endorphins / Q000502:physiology*; D006801:Humans; D009270:Naloxone / Q000627:therapeutic use; D010146:Pain / Q000503:physiopathology*; D011537:Pruritus / Q000188:drug therapy / Q000503:physiopathology*
D004723:Endorphins; D009270:Naloxone