Explanation
•This pain may be of peritoneal origin. This is a well-localized pain that causes rigidity of the abdominal muscles where the pain increases with any pressure or motion.
•Pain of renal origin begins in the flank area and may radiate to the lower abdomen, back, and groin.
•Pain of biliary origin is in the right upper quadrant and may radiate to the right shoulder.
•Pain of meningeal origin is associated with headache, nuchal rigidity, and photophobia. Pain is increased when the neck is flexed toward the chest.