Causes include chronic disorders (eg, cancer, arthritis,
diabetes) and injuries (eg, herniated disk, torn ligament), and
many primary pain disorders (eg, neuropathic pain, fibromyalgia,
chronic headache). Various drugs and psychologic treatments are
used. ... With sensitization, discomfort that is due to a nearly resolved disorder...
http://www.merck.com/mmpe/sec16/ch209/ch209b.html
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