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An improved understanding of neuropathic pain.

Neuropathic pain represents a series of relatively uncommon chronic pain conditions, caused by lesions or dysfunctions of peripheral or central afferent pathways in the nervous system. The symptoms and signs of neuropathic pain can all be explained by a neuronal hyperexcitability at the site of the nerve lesion, which subsequently and in a dynamic fashion recruits more central sites. The manifestations of such neuronal hyperexcitability are therefore rather similar, irrespective of the causes or sites of the lesions. The key findings in neuropathic pain are: (a) pain in an area with sensory loss; (b) positive sensory symptoms such as dysesthaesia and allodynia in the injured area, where sensory discrimination is abolished; and (c) an abnormal sympathetic activity. Our understanding of the mechanisms underlying neuronal hyperexcitability has increased dramatically within the last decade, and accordingly, it has been suggested that pain be classified according to a mechanism-based approach. The challenge for an improved understanding of neuropathic pain--which is the key for better treatment--lies in elucidating the relationships between symptoms, signs, aetiology, anatomical lesions, and underlying mechanisms. At present, this is not a trivial task.

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