What’s a kidney stone?

What’s a kidney stone?

A stone in your kidney is an irregularly-shaped solid mass or crystal that can be as small as a grain of sand up to the size of a golf ball. Depending on the size of your kidney stone (or stones), you may not even realize that you have one. Even small stones can cause extreme pain as they exit your body through your urinary tract. Drinking fluids may help the process, which can take as long as three weeks.

A large kidney stone can get trapped in your ureter (the tube that drains urine from your kidney down to your bladder). When this happens, the stone can cause bleeding and keep urine from leaving your body. You may need surgery for a stone that can’t pass on its own.