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Getting too much vitamin D can cause kidney stones. The stones aren't made of vitamin D itself, though. Excess vitamin D can make you absorb too much calcium -- and if you have too much calcium in the urine, it can crystallize into stones.
A kidney stone can cause symptoms when the small mass travels from the kidney through a narrow tube called the ureter toward the bladder. The stone can block or irritate the tube, causing intense pain.
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