ABSTRACT
Pain is the common thread that weaves all the medical disciplines—medicine, dentistry, osteopathy, or chiropractic—together. The nociceptive pain is a diffuse, alarming, unpleasant pain with a tendency for originating referred pain. The paleospinothalamic tract is mainly responsible for stimulation of the sympathetic nervous system. Reflex sympathetic dysfunction is a form of complex chronic pain that mainly stimulates the limbic system and causes highly emotional hyperpathic pain. Chronic pain has a tendency to persist long after the occurrence of the original noxious injury. Chronic pain in and of itself need not be miserable or intractable. Normal older people often wake up with some chronic aches and pains. Sympathetic pain known as hyperpathic, allodynic, or neuropathic pain, is different from somatic or somesthetic pain due to the fact that the pain is out of proportion to the peripheral injury, and it is accompanied by a burning feeling that is quite disabling and intolerable.
