Twelve percent of men and seven percent of women will get a kidney stone in their lifetime. Your chance of having a kidney stone doubles if you have a family member who has had one. The average kidney stone is about 5 mm (0.2 inches). Most kidney stones will pass on their own, but some need to be removed. The biggest kidney stone on record, which had to be surgically removed, was 2.5 pounds!
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After seeing the picture of a kidney stone you know why they are so painful.