Kidney stones form when minerals or acid salts in your urine crystalize. Most stones leave your body while you urinate. However, in some cases you may need treatment to remove the stone.
People often associate kidney and ureteral stones with pain. However, symptoms can vary from severe pain to no pain at all, depending on stone characteristics – such as the size, shape, and location of the stone in the urinary tract.
Kidney_ureteral_stones Not all stones require treatment. You need treatment if your stone causes discomfort and does not pass naturally with urine. Your doctor may also advise treatment if you have pre-existing medical conditions.

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European Urological Association – Kidney and Ureteric Stones