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!
Kidney stone:
Healthfacts.blog 
After seeing the picture of a kidney stone you know why they are so painful.
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