One of the most humbling physical experiences humans have had to endure since the beginning of recorded history involve the suffering caused by an attack of kidney stones, termed renal colic. The pain has been variably described as being equivalent to childbirth without anesthesia or getting stabbed repeatedly in the back with a large sharp knife. Ironically, it is when the stone is passing that the pain from the stone is most intense with larger immobile stones often asymptomatic.
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