This big around:
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How Big Is An 8mm Kidney Stone?
Well 6 cm is about half an inch, so 8mm is one thousanth of a time smaller. So this is one thousand times smaller than a little over half an inch and yes, even though so small, can be very painful. May be the size of a grain but feels like a bowling ball. There are now treatments for such stones that do not involve surgery, explore your options with your doctor and see if there is some medication that can be given to help dissolve
