Pain due to kidney involvement is most likely referred to which regions?

• A. Ipsilateral flank and groin
• B. Left upper quadrant
• C. Suprapubic pain
• D. Left shoulder

Answer: (A)

Pain from the kidneys is a form of referred visceral pain. The kidney’s sensory nerves travel with the sympathetic system to spinal levels around T10 to L1, so the brain perceives the pain in the body wall areas served by those nerves rather than deep in the retroperitoneal organ itself. That means kidney-related pain is typically felt on the same side in the flank region near the kidney (the costovertebral angle) and can radiate downward toward the groin as the ureter transmits the pain toward the bladder and genital area. This explains why the most common description is pain on the same side of the body in the flank and groin.

Other regions don’t fit the pattern because they’re associated with different organs or mechanisms: left upper quadrant pain points to upper abdominal organs like the stomach or spleen; suprapubic pain is more typical of bladder or pelvic issues; and left shoulder pain usually indicates diaphragmatic irritation or other thoracic issues.