<unk> ", or analgesic<unk> , was created by the World Health Organization (WHO) as a guideline for the use of drugs in the management of pain. Originally published in 1986 for the management of cancer pain, it is now widely used by medical professionals for the management of all types of pain. The general principle is to start with first step drugs, and then to climb the<unk>  if pain is still present. The medications range from common, over-the-counter drugs at the lowest rung, to strong opioids.
Pain ladder
Pain scale
Textbook of Pain
King's pain recorder
Schmidt sting pain index
Modified Ashworth scale
Prader scale
Figure rating scale