Kidney stones are pieces of a stone or crystal-like material that form inside the kidneys or urinary tract. The kidneys are two bean-shaped organs located in the lower back. Their main function is to remove waste from the body and to balance the water and electrolyte content of the blood by filtering the salt and water in the blood. The waste and water excreted by the kidneys combine to form urine.
There are several types of kidney stones. The most common type contains mostly calcium along with phosphate or oxalate. Others may contain uric acid, struvite, and/or cystine.




