Pain associated with chronic disease can not be treated properly and that causes pain: osteoarthritis, diabetes (can cause neuropathy), multiple sclerosis, cancer, AIDS, trigeminal neuralgia, sickle cell anemia, etc..
A poorly relieved acute pain that persists beyond the normal period of recovery or lasting longer than six months: after an accident at work (eg back pain), surgery, an episode of shingles, etc..
Pain whose cause is poorly defined: migraine, fibromyalgia.
A phantom pain following an amputation. In this case, the pain comes from damage done to the nerves.
Pain maintained by the nervous system without apparent trigger, as is the case of regional pain syndrome complex.
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