Chronic cancer pain: defined as cancer or treatment related visceral (within the internal organs), musculoskeletal, or bony pain. Chronic post-traumatic pain: pain lasting 3 months after an injury or surgery, excluding infectious or pre-existing conditions. Chronic neuropathic pain: pain caused by damage to the somatosensory nervous system. Chronic headache and orofacial pain: pain that originates in the head or face, and occurs for 50% or more days over a 3 months period. Chronic visceral pain: pain originating in an internal organ. Chronic musculoskeletal pain: pain originating in the bones, muscles, joints or connective tissue.Chronic pain may be divided into "nociceptive" (caused by inflamed or damaged tissue activating specialized pain sensors called nociceptors), and "neuropathic" (caused by damage to or malfunction of the nervous system).Nociceptive pain can be divided into "superficial" and "deep", and deep pain into "deep somatic" and "visceral". Superficial pain is initiated by activation of nociceptors in the skin or superficial tissues. Deep somatic pain is initiated by stimulation of nociceptors in ligaments, tendons, bones, blood vessels, fasciae and muscles, and is dull, aching, poorly-localized pain. Visceral pain originates in the viscera (organs). Visceral pain may be well-localized, but often it is extremely difficult to locate, and several visceral regions produce "referred" pain when damaged or inflamed, where the sensation is located in an area distant from the site of pathology or injury.Neuropathic pain is divided into "peripheral" (originating in the peripheral nervous system) and "central" (originating in the brain or spinal cord).
Effect of chronic pain in the workplace
In the workplace, chronic pain conditions are a significant problem for both the person with the condition and the organization; a problem only expected to increase in many countries due to an aging workforce. In light of this, it may be helpful for organizations to consider the social environment of their workplace, and how it may be working to ease or worsen chronic pain issues for employees. As an example of how the social environment can affect chronic pain, some research has found that high levels of socially prescribed perfectionism (perfectionism induced by external pressure from others, such as a supervisor) can interact with the guilt felt by a person with chronic pain, thereby increasing job tension, and decreasing job satisfaction. Mobility and road safety impacts
A 2022 systematic review found that chronic pain could increase crash risk among drivers. Chronic pain drivers report experiencing difficulties with safety maneuvers, such as shoulder checking for blind spots, merging with traffic, turning corners, and reversing the vehicle. See also
Childhood chronic pain
Neuroinflammation
Neurodegeneration
Dopaminergic pathways

References
Further reading
External links
Chronic Pain Syndromes at Curlie
 Media related to pain at Wikimedia Commons
International Association for the Study of Pain Archived 2021-05-01 at the Wayback Machine