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Kidney stones

Kidney stones are also called renal stones or urinary tract stones. They are clusters of tiny crystals that can form in the kidneys.

Most clusters are too small to cause any problems and pass out of the body in the urine. Sometimes, the clusters can clump together to form bigger clusters, which may eventually become big enough to block the filtering units in the kidney.

More information for parents and visitors on kidney stones

Watch our animation to find out more about how the kidneys work.

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