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Kidney Stone

Kidney stones are made of salts and minerals in the urine that stick together to form small "pebbles." They may form when the normal balance of water, salts, minerals, and other substances found in urine changes. How this balance changes determines the type of kidney stone you have. Most kidney stones are calcium-type-they form when the calcium levels in your urine change.

By Healthwise Staff
Primary Medical Reviewer Anne C. Poinier, MD - Internal Medicine
Specialist Medical Reviewer Tushar J. Vachharajani, MD, FASN, FACP - Nephrology
Last Revised April 28, 2011

WebMD Medical Reference from Healthwise

Last Updated: April 28, 2011
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