A kidney stone (renal calculi) is a hard, crystalline mineral material formed within the kidney or urinary tract. Kidney stones are a common cause of blood in the urine (hematuria). Key Symptoms:
Severe pain in the side, back and below the ribs.
Pain that radiates to the lower abdomen and groin.
Pain that comes in waves and fluctuates in intensity.
Pain on urination.
Pink, red or brown urine.
Cloudy or foul-smelling urine. Nausea and vomiting