Kidneystones are another collective kidney problem. They occur when minerals and other substances in the blood crystallize in the kidneys, developing solid masses. Kidney stones usually come out of the body through urination. Passing kidney stones can be awfully painful, but they rarely cause significant problems.
A kidney stone is a solid portion of material that forms in the kidney from constituents in the urine. It may be as minor as a particle of sand or as large as a nugget. Most of the kidney stones pass out of the body without help from a physician. But occasionally a stone will not go away. It may get stuck in the urinary tract, block the flow of urine, and cause great throbbing. And kidney stones can be removed with medicines or shock waves. Shock waves are used with a scope, interleaved through the tube that carries urine out of the body, called the urethra, or with surgery.
The following may be signs of kidney stones that need a doctor's help: