Final answer:
If a nephrotic patient suddenly develops flank pain, it could be a sign of renal colic, which is often caused by kidney stones.
Step-by-step explanation:
If a nephrotic patient suddenly develops flank pain, it could indicate a condition called renal colic, which is commonly associated with kidney stones. Renal colic causes severe episodic pain in the flank, lower abdomen, and groin. Other symptoms may include nausea, vomiting, and hematuria (bloody urine).