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Mayo Clinic Staff,
Nov 22, 2023
Kidney stones are small, hard deposits made of minerals and reoccurring materials inside the kidneys. Stones often go unnoticed in the kidney until they move into the ureter —the tube connecting the kidney and bladder.
If a stone leaves the kidney and blocks urine from exiting, usually while in the ureter, it can cause urine to back up and lead to intense pain.
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