Pain Clinic Directory
Chronic pain was originally defined as pain that has lasted 6 months or longer. It is now defined as pain that persists longer than the normal course of time associated with a particular type of injury. This constant or intermittent pain has often outlived its purpose, as it does not help the body to prevent injury. It is often more difficult to treat than acute pain. Expert physician care is generally necessary to treat any pain that has become chronic. When opioids are used for prolonged periods drug tolerance, chemical dependency and even psychological addiction may occur. Chemical dependency is common among opioid users; however, psychological addiction is less frequent. Apparent drug tolerance to the pain-relieving effects of opioids may occur. This may be confused with progression of the underlying disease in cancer patients rather than an actual decrease in efficacy of the drug.