RT Book, Section A1 Coffa, Diana A1 Mehling, Wolf A2 LaDou, Joseph A2 Harrison, Robert J. SR Print(0) ID 1104101401 T1 Management of Chronic Pain T2 CURRENT Diagnosis & Treatment: Occupational & Environmental Medicine, 5e YR 2013 FD 2013 PB McGraw-Hill Education PP New York, NY SN 9780071808156 LK accessmedicine.mhmedical.com/content.aspx?aid=1104101401 RD 2024/04/24 AB Chronic pain is variously defined as (1) pain lasting more than 3 months, (2) pain lasting more than 6 months, and (3) pain lasting beyond the period of expected healing or persisting in the absence of injury. Chronic pain is distinguished from acute pain in a number of ways. Most concretely, it lasts longer. In many cases, though, what is genuinely unique about chronic pain is that it seems to persist even when a physical insult is not occurring, or it is out of proportion to the physical damage that has occurred.