If ignorance about the nature of pain is widespread, ignorance about the way pain-killing drugs is even more so. What is not generally understood is that many of the vaunted pain-killing drugs conceal the pain without correcting the underlying condition. They deaden the mechanism in the body that alerts the brain to the fact that something may be wrong. The body can pay a high price for suppression of pain without regard to its basic cause.
Norman Cousins, Anatomy of an Illness: As Perceived by the Patient
health, pain