Kidney stones occur when minerals and other substances in your urine crystallize in your kidneys, forming solid masses, or stones. These may consist of small, sharp-edged crystals or smoother, heavier formations that resemble polished river rocks. They usually exit your body naturally during urination.
However, sometimes your body can’t pass larger formations through urination. This can lead to kidney damage. People with kidney stones may experience bleeding, severe pain, or urinary tract infections. When stones begin to cause these types of problems, your doctor may suggest lithotripsy.