[Chronic pain: medico-biologic and sotsio-economic aspects].

In this article the role of neurobiological, psychological and social factors in pathogenesis of chronic pain is analyzed. The chronic pain is considered not as a symptom of damage of tissue and as independent illness due to non-adequate neuroplasticity of systems involved into regulation of pain sensitivity. The major role in development and maintenance of chronic pain is devoted to the primary genetically determined and/or secondary disturbance of interaction between nociceptive and antinociceptive systems at various levels--from peripheral neuron to central structures--that provides pain perception and painful behaviour development.