Lithotripsy 4 times a year is harmful to the kidneys. Extracorporeal lithotripsy is an invasive operation. Although the shock wave of extracorporeal lithotripsy has the greatest energy to crush the hard stone in the kidney, it also has some damage to the kidney. As long as you choose a regular hospital and do not blindly treat, the damage to the kidney from the shock wave is mild and reversible, so the damage to the kidney from one lithotripsy is generally small. However, repeated lithotripsy will increase the burden of the kidney, and the stones shattered by the shock wave will also cause damage to the kidney tissue cells, so repeated lithotripsy is not recommended. Moreover, if the kidney itself has organic diseases such as chronic nephritis, lithotripsy may even lead to the rupture of the kidney.