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Flank pain is a sensation of discomfort, distress, or agony in the part of the body below the rib and above the ilium, generally beginning posteriorly or in the midaxillary line and resulting from the stimulation of specialized nerve endings upon distention of the ureter or renal capsule. Similar pain is sometimes caused by extraurinary abnormalities. Causes of flank pain are listed in Table 182.1.