A kidney stone is a small hard cluster of substances such as calcium, uric acid, magnesium, ammonia, and oxalate. When the fluid in your urine cannot dilute them, these substances come together and crystallize forming kidney stones. These stones may be as small as a grain of sand, or as large as a pearl. Stones can form in any part of the urinary tract and can lead to a kidney infection. You don't have to contract a bladder infection first to develop kidney stones. The crystalline materials act as a blockage in the ureters. Kidney stones don't cause pain when they're dormant and located in the kidney. However, when they pass from kidney to bladder, this can be extremely painful.
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