Calculus of kidney
A kidney stone is a hard, pebble-like object made of minerals that forms inside your kidney when your urine becomes too concentrated.
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Find General PhysiciansClinical Overview
Your kidneys are two bean-shaped organs in your back that filter waste out of your blood to make urine. Sometimes, chemicals like calcium, oxalate, or uric acid in your urine stick together to form a solid stone, known as a calculus of the kidney. These stones can range in size from a tiny grain of sand to as large as a golf ball.
While small stones might pass out of your body without you noticing, larger stones can get stuck. When they move through the narrow tube connecting your kidney to your bladder—called the ureter—they can cause intense pain and block the flow of urine.
Common Symptoms
- Sharp, stabbing pain in your back or side, just below your ribs.
- Pain that comes in waves and spreads to your lower belly or groin area.
- Pain or a burning sensation while urinating.
- Blood in your urine, which might look pink, red, or brown.
- Feeling like you need to urinate constantly, but only passing a small amount.
- Nausea or vomiting due to intense pain.