Which signs suggest a kidney stone is actively moving and may require urgent evaluation?

• A. Sudden sharp flank or groin pain radiating to testicle or inner thigh, hematuria, nausea/vomiting
• B. Mild dull ache that improves with rest
• C. Fever only
• D. Chronic back pain

Answer: (A)

When a kidney stone is actively moving, it produces acute, severe, colicky pain as the ureter contracts around the stone. This pain often starts in the flank and then radiates to the groin, testicle in men, or inner thigh. Blood in the urine is common due to irritation of the urinary tract, and nausea or vomiting frequently accompanies the intense pain from autonomic nervous system stimulation. Together, these signs point to active movement with possible obstruction, which requires urgent evaluation to manage pain, assess for blockage, and prevent complications like hydronephrosis or infection.

Milder, dull pain that improves with rest, fever by itself, or chronic back pain do not fit the pattern of moving ureteral stone and are less likely to indicate an urgent obstructive stone.