If kidney stones are treated using extracorporeal shock wave lithotripsy, the procedure depends on the size and location of the stones, among other factors. Whether the stones can be effectively expelled after the procedure also varies from person to person, but generally, it tends to be successful. Kidney stones are caused by the accumulation of crystalline substances in the kidneys, and there are many reasons for the formation of kidney stones, including diet, genetics, environment, occupation, and other factors. The specific cause can only be confirmed after the stone is removed for pathological analysis. Generally, when the stones are relatively small, such as less than 0.5 centimeters, it is advisable to drink more water and undergo some important auxiliary treatments. Under the guidance of a physician, medication can be used as needed. For stones measuring 0.5 to 2 centimeters, extracorporeal shock wave lithotripsy is required to break the stones and then expel them. If the stone exceeds 2 centimeters, surgical treatment is generally necessary.