The ureters are the tubes that allow urine to flow from the kidneys to the bladder. Sometimes, stones – hard, small deposits of minerals or acid salts – get lodged in these tubes (ureteral calculi). The stones may originate in the kidney, bladder or ureters.
Stones are more common among middle-aged and older adults and are more common among men than women. Most of these stones are very small and pass spontaneously out of the body. Larger stones may not be expelled from the body and can obstruct the flow of urine or create infection. The size and location of kidney stones and the presence of kidney infection are determined in an exam.
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