Kidney Stones

What is a kidney stone?

A kidney stone is a solid piece of material that forms from crystallization of excreted substances in the urine. The stone may remain in the kidney or break loose and travel down the urinary tract. A small stone may pass all of the way out of the body, but a larger stone can get stuck in a ureter, the bladder, or the urethra. This may block the flow of urine and cause great pain.

Learn more about the types and sympstoms of kidney stones.


Causes & Prevention

Kidney stones are a common problem, affecting about 12 percent of men and 5 percent of women. Stones are typically caused by an imbalance in the urinary system: too little water, too much oxalate, or too much calcium.

In this video, you'll find out how the stones develop and what you can do to prevent them.