Living with Chronic Pain website has mentioned an article in the American Pain Foundations recent Newsletter. It says that A. Vania Apkarian, PhD, professor of physiology and of anesthesiology at Northwestern University’s Feinberg School of Medicine has done research that leads him to believe that "chronic pain appears to be an old memory trace that essentially gets stuck in the prefrontal cortex, the site of emotion and learning." With his new understanding of the pain source, "Dr. Apkarian also found that the longer a person has been suffering from chronic pain, the greater the activity in the prefrontal cortex" which he believes to be from accumulative memory.
One thing I personally know for certain now is that old pain is recurring when I have flare ups with Complex Regional Pain Syndrome
You'll find a link to "Living with Chronic Pain" website to the left of this blog under "articles of interest". You'll find a link to Northwestern University Feinburg School of Medicine under "crps/rsd related articles" to the left of this blog. It's worth singing up for the APF newsletter which provides relevent, topical and up to date information about pain.