This term refers to stones in the urinary system. They form in the kidneys but can be found anywhere in the urinary system. They vary in size and the amount of pain they cause. Many of these stones can pass though without help but some require intervention. Surgical intervention for kidney stones is provided by the Urology service. Recurrent kidney stones may require further evaluation and management to reduce these episodes. The Waitematā District Renal service provides medical and dietary support for such patients.