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Most kidney stones are composed of uric acid, which is a byproduct of the digestion of protein. Kidneys filter uric acid out of the blood, and if the concentration of uric acid is too high, you can get a precipitation of uric acid into a solid form, since the solubility of uric acid is moderate, but not high. Solid uric acid is then a stone, a solid object inside the kidney, where it causes trouble until it passes out with the urine.

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12y ago

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