Renal colic after lithotripsy may be caused by infection after lithotripsy, such as pyelonephritis; it may also be caused by irritation of ureter by crushed stone in the process of stone expulsion, or it may even be caused by the stone not being crushed. 1. Infection: Some patients may develop pyelonephritis after lithotripsy, which may cause renal colic, high fever, chills, hematuria and other symptoms. Urine routine examination will find elevated white blood cells. 2. Stone irritation:After the stone is crushed in some patients, the stone will irritate the ureter in the process of falling, which may lead to renal colic. Further review of ultrasound or CT examination is needed to clarify. 3. Uncrushed stones: Although some patients have undergone extracorporeal lithotripsy, if the stones are hard, the lithotripsy effect will be poor or even ineffective, and the symptoms of renal colic will still exist. In general, there are many reasons for renal colic after lithotripsy treatment, and it may be caused by other factors, so you need to go to the regular hospital in time to check the cause of the disease and carry out targeted treatment.