Kidney Stones

Kidney stones are made of salts and minerals in the urine that stick together to form small "pebbles." They can be as small as grains of sand or as large as golf balls.

Kidney stones form when the normal balance of water, salts, minerals, and other things found in urine changes. This can happen if you do not get enough fluids (dehydration) or if you eat foods high in oxalate, such as dark green vegetables.