Buy backpacks, exercise machines, athletic shoes, and more at Fogdog Sports. Further Reading This kidney stone is being fragmented by sound waves. Definition Kidney stones are solid accumulations of material that form in the tubal system of the kidney.
Kidney stones cause problems when they block the flow of urine through or out of the kidney.
When the stones move along the ureter, they cause severe pain. Description Urine is formed by the kidneys. Sometimes, a problem causes the dissolved substances to become solid again. Tiny crystals may form in the urine, meet, and cling together to create a larger solid mass called a kidney stone. Many people do not ever find out that they have stones in their kidneys.