Your kidneys are bean-shaped organs located in the middle of your back, on either side of your spin...
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Your kidneys are bean-shaped organs located in the middle of your back, on either side of your spine. They process blood to sift out waste products and extra water, which becomes urine. Kidney stones are formed mostly from deposits of calcium in the outer layer or cortex of the kidney. Inside the kidney's basic filtering unit, called the glomerulus, stones are slowly built up from the joining of calcium-containing molecules. This build-up can turn into a stone, called a renal calculus, which can eventually clog the ureter - the tube leading down from the kidney to the bladder. Once this tube is blocked, it can become difficult for urine to pass out of the body. If the flow of urine is blocked, pressure can build and cause pain that begins suddenly in the back or abdomen. As it moves down this very sensitive tube, the renal calculus can be the source of extreme pain.