How Long Do Kidney Stones Last? Kidney stones are a prevalent and often painful condition that impacts nearly one in 10 Americans each year. While the experience can be challenging, knowledge about kidney stones, their symptoms, and potential treatment options is crucial. What are Kidney Stones? Kidney stones, also called renal calculi, are solid formations that start in the kidneys. They form when certain waste products struggle to dissolve properly in urine, leading to the ...