Kidney Stone

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Kidney Stone

Kidney stone (magnified)

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.

Current as of: April 15, 2020

Author: Healthwise Staff

Medical Review: E. Gregory Thompson, MD - Internal Medicine

Adam Husney, MD - Family Medicine

Kathleen Romito, MD - Family Medicine

Tushar J Vachharajani, MD, FASN, FACP - Nephrology