what actualy CAUSES a kidney stone to break free of your kidney?

I cand find out all sorts of information on stones EXCEPT what causes them to break free in the first place. Can any one help?

  1. Arundhati Bakshi, 17 May, 2010

    Water. Lots of it.

  2. TweetyBird, 17 May, 2010

    I would think that the size of the calculus has much to do with this. Smaller stones can be moved by the flow of urine and travel outside of the kidney and into a ureter until they reach a point through which they are too large to pass. Renal calculi aren’t anchored.

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