Chronic pain is one of the most common reasons for seeing a primary care physician.
Classification of chronic pain may be based on major pain features or by body region: myofascial, musculoskeletal (mechanical), neuropathic, fibromyalgia, and chronic headache syndromes.
One in 3 patients over the age of 65 years is affected by chronic pain, often due to arthritis, osteoporosis with fractures and/or lumbar spinal stenosis. These conditions are treatable and should not be considered part of the normal aging process. Untreated chronic pain in geriatric patients can result in depression, poor quality of life, and loss of independence.
Some treatments, such as stretching exercises, relaxation techniques, antidepressants and antiepileptic drugs, are beneficial for a wide variety of chronically painful conditions.
About 25% to 30% of chronic pain patients treated with opioids will demonstrate medication abuse behavior.
Acute pain is a common consequence of injury or illness, generally lessening shortly after onset and resolving once healing is complete. Since healing occurs over a maximum of 3 months, pain persisting longer than 3 months is deemed chronic pain or persistent pain. Chronic pain may also occur in patients with ongoing degenerative illnesses, such as rheumatoid arthritis, or other chronic conditions, like migraine or neuropathic pain. Neuropathic pain is characterized by allodynia and hyperalgesia. Allodynia is the perception of non-noxious stimuli as painful. In hyperalgesia, noxious stimuli produce exaggerated or prolonged pain. Pain severity may fluctuate in patients with chronic pain, with times of increased pain or pain flares occurring either in relation to increased activity or stress, or insidiously. Chronic pain occurs due to persistent activation of neural pain pathways and muscle spasm. Chronic pain is discussed here as a syndrome and includes nonmalignant conditions without localized or regional causes (such as abdominal pain or pelvic pain).
Consultant, Pain Medicine and Anaesthesia
North Bristol NHS Trust
GC has been sponsored by Boston Scientific, St Jude Medical, and Nevro to attend cadaveric workshops relevant to neuromodulation.
Dr Gaurav Chhabra would like to gratefully acknowledge Dr Sarah Love-Jones and Dr Dawn A. Marcus, previous contributors to this monograph. SLJ has received consultancy fees for Boston Scientific and Nevro Corporation (regarding spinal cord stimulation) and is an Elected Council member of the British Pain Society. DAM is an author of a reference cited in this monograph.
Department of Anesthesiology
University of Washington School of Medicine
JDS declares that he has no competing interests.
Consultant in Pain Management
King's College Hospital
JH has chaired advisory boards for Napp Pharmaceuticals Ltd., chaired a symposium, is a principle investigator and has participated in advisory boards for Grunenthal Ltd., and has given lectures for Pfizer Ltd. JH has also attended the American Pain Society meeting in 2009 sponsored by Grunenthal.
Consultant in Pain Medicine
Pain Management Service
University Hospitals of Leicester
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