This type of pain is also called irradiated segmental pain. This pain is felt in areas of the same spinal segments of the stimulated viscus. The sensation can also extend to adjoining segments.
Figure 24.1 Phases of pain. Left, true visceral pain is always perceived in the same site (shaded area) whether it originates from the esophagus (e), heart (h), gallbladder (g), spleen (s), pancreas (p), or appendix (a). Right, referred pain from viscera is perceived in different areas according to the viscus of origin (arrows).
Additional stimuli exerted on the area of referral do not increase the painful symptoms, and the pain threshold is not decreased. Infiltration with local anesthetic in the site where pain is felt produces no effect.
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