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Explanatory model of chronic pain.

Chronic pain is considered a syndrome because of the associated symptoms that develop in those experiencing this disorder. Chronic pain is defined as reoccurring or persistent pain lasting more than 3 months. Chronic pain continues past normal healing times and therefore does not have the same function as acute pain, which is to signal that there is a threat so the body can avoid future danger. Pain can be categorized according to its location, cause, or the anatomical system which it affects. The newest standard for classifying chronic pain was created for the ICD-11. This new classification system emphasized the cause of pain, underlying mechanisms, body sites, and the biopsychosocial model of chronic pain. This classification system differentiates chronic primary pain from chronic secondary pain, incorporates already existing diagnosis, and further characterizes chronic pain syndromes. (Full list...)