Final answer:
A 49-year-old man presenting with acute-onset flank pain and hematuria likely has symptoms of kidney stones. Kidney stones can cause obstruction of the ureter, resulting in severe pain in the flank, lower abdomen, and groin.
Step-by-step explanation:
A 49-year-old man presenting with acute-onset flank pain and hematuria likely has symptoms of kidney stones. Kidney stones are formed in the urinary tract and can cause obstruction of the ureter, resulting in severe episodic pain in the flank, lower abdomen, and groin. Hematuria, or blood in the urine, is commonly present due to damage to the lining of the urinary tract.