Kidney stones are not an uncommon problem and all of us are at risk of developing kidney stones. The urine has substances which can develop into stones, but these are usually not crystallized to form stones. Even if stones develop in most people they are small (<5mm) and they pass in urine without any symptoms. The most commonly formed stone in the kidney are made of calcium oxalate. Other stones that are formed in the kidney include cysteine stone, struvite stone (magnesium, ammonium and phosphate), calcium phosphate stone, uric acid stone, etc.
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