It fulfils the same function as pain in the human body. It calls attention to an unhealthy state of things.
Winston Churchill

Totally agree, have had others suggest pain pills when something was ailing, and I have always said NO. They were dazed, it will make you feel better (back- leg - hand etc. ) and I have told them that pain is your bodys way of saying WHOA back off and chill out. Not medicate and push some more. Woody

Glad to see a good quote.