Kidney stones can be tiny — sometimes as small as a grain of sand or rice — but they can still cause severe pain. That’s because the pain usually comes from a stone blocking or stretching the ureter (the tube that carries urine from the kidney to the bladder) as it moves through the urinary tract.Here’s what you need to know about kidney stones, what causes them and how to treat them.​What is a kidney stone?The kidney’s job is to clean your blood and get rid of waste through your urine. When there are too many minerals and salts in your urine and not enough water for them to dissolve in, they...

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