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.