Renal colic is the intense, cramping pain felt when a kidney stone moves through the urinary tract. It typically strikes in waves across the flank and lower back, radiating toward the groin, and sufferers often describe it as one of the most severe pains they have known. It comes with restlessness, nausea, vomiting, and sometimes blood in the urine as the stone scrapes the ureter. The pain eases only when the stone passes into the bladder or is removed. Management focuses on strong pain relief, hydration, and medical expulsive therapy to help the stone along, with intervention for stones that will not pass. Preventing recurrence means identifying the stone’s composition and correcting the dietary and metabolic factors behind it.