Some conditions can cause pain in different regions, and it may be difficult to associate the disease with the location of the pain. Localization of the source of abdominal pain is confounded by the nature of the pain receptors involved. Further, the type of pain associated with a particular disease may change as the disease process progresses, as in appendicitis. Abdominal pain may be classified as visceral, somatoparietal, and referred pain. Most abdominal pain is associated with visceral pain receptors.
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