It is due to injury to body wall structures. The pain is typically well localized and intermittent. It is often mechanically reproducible. Visceral pain results from activation of visceral nociceptive receptors and visceral efferent nerves, and is characterized by a deep aching, cramping sensation. Neuropathic Pain Neuropathic pain results from direct injury to peripheral receptors, nerves, or central nervous system.
Sensory alteration is often present at the site where the pain is.
Neuropathic pain is opiate resistant at usual doses.