Chronic pain is pain that lasts a long time. In medicine, the distinction between acute and chronic pain is sometimes determined by an arbitrary interval of time since onset; the two most commonly used markers being 3 months and 6 months since onset, though some theorists and researchers have placed the transition from acute to chronic pain at 12 months.
Others apply acute to pain that lasts less than 30 days, chronic to pain of more than six months duration, and subacute to pain that lasts from one to six months. A popular alternative definition of chronic pain, involving no arbitrarily fixed duration, is “pain that extends beyond the expected period of healing”.Epidemiological studies have found that 10.1% to 55.2% of people in various countries have chronic pain
Chronic pain may originate in the body, or in the brain or spinal cord. It is often difficult to treat. Various nonopioid medicines are recommended initially, depending on whether the pain originates from tissue damage or is neuropathic. Psychological treatments including cognitive behavioral therapy and acceptance and commitment therapy may be effective for improving quality of life in those with chronic pain. Some people with chronic pain may benefit from opioid treatment while others are harmed.A trial of opioids is only recommended in those with non cancer pain who have no history of either mental illness or substance use disorder and should be stopped if not effective.