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How are kidney stones formed?

The technical term for kidney stones is renal calculi (you may be able to find more info. using this term) there are many different causes. Metabolic disturbances, hyperparathyroidism, urinary obstruction, infection, dehydration, drugs or chemotherapy, or a fixed pH (the pH of urine changes over the course of a day and helps to prevent crystal formation, if it stays the same pH, crystals form more easily). Kidney stones are made of crystals such as calcium oxalate, uric acid, calcium phosphate, etc.

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