Neurobiology of Chronic Pelvic Pain
The International Association for the Study of Pain defines pain as an unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in term of that damage. Chronic pain is much more than noxious nociception; it is a complex condition with sensory, adaptive, and affective components. Whereas acute pain has biologic utility, chronic pain does not appear to confer any evolutionary advantage
Chapter, 2011