Kidney stones often move through the urinary tract and leave the body without any symptoms at all. Such stones are referred to as "silent" stones, and are usually very small (under four millimeters).
Larger calculi cannot be excreted and even small stones can cause problems by becoming lodged in the ureter, the long narrow tube that carries urine from the kidney to the bladder. One of the typical symptoms of kidney stones is severe pain.
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