Crystals formed in the kidneys that cause obstruction and are more likely in males; S/S include severe abdominal pain, groin pain, painful urination, fever, nausea, and vomiting.

• A. Urinary Tract infection
• B. Gastroenteritis
• C. Kidney stones
• D. Ulcers

Answer: (C)

Kidney stones form crystals in the kidneys that can obstruct urine flow, often causing sudden, severe flank or groin pain as the stone moves through the urinary tract. This pain is typically intense, comes in waves, and may be accompanied by nausea or vomiting. Painful urination occurs because the stone irritates the lining of the urinary tract, and fever can occur if an infection is present with the obstruction. Stones are more common in males, fitting the given detail.

This pattern best matches kidney stones because the combination of severe, radiating pain with urinary symptoms and possible fever aligns with ureteral obstruction by a stone. Urinary tract infections can cause dysuria and fever but rarely produce the abrupt, colicky flank-to-groin pain. Gastroenteritis and ulcers center on gastrointestinal symptoms and don’t fit the described urinary obstruction.