The McGill Pain Questionnaire, also known as McGill pain index, is a scale of rating pain developed at McGill University by Melzack and Torgerson in 1971. It is a self-report questionnaire that allows individuals to give their doctor a good description of the quality and intensity of pain that they are experiencing. Users first select a single word from each group that best reflects their pain. Users then review the list and select the three words from groups 1–10 that best describe their pain, two words from groups 11–15, a single word from group 16, and then one word from groups 17–20. After completing the questionnaire, users will have selected seven words that best describe their pain. Users can use some words more than once.