Kidney stones, or in their medical term Nephrolithiasis, form when there is a block of urine flow out of both kidneys which can cause a number of painful symptoms that can be very severe.
The kidneys are a part of the excretory system. They filter toxins out of the blood and pass them to the bladder as urine.
Kidney stones can block the flow of urine through the kidney, ureters, and/or urethra, depending on where they are lodged. The ureters are tubes from the kidney to the bladder, and the urethra