Extracorporeal lithotripsy, or extracorporeal shock wave lithotripsy, is a method of treating urinary stones, and there is no such thing as whether or not there is a recurrence. The so-called recurrence, usually refers to the recurrence of urinary stones, not related to the method of treatment of stones, any method of treatment of stones may recur, broadly speaking, the reasons for recurrence are usually incomplete treatment of lithotripsy, the factors that cause the stones still exist, and so on. 1. Incomplete lithotripsy treatment: if the size of the stone is too big, it will be difficult to be powdered; obesity will reduce the lithotripsy effect; the composition of the stone also affects the lithotripsy effect, such as cystine stone lithotripsy effect is relatively poor, the above reasons may lead to the stone is not completed discharged, strictly speaking, does not belong to the recurrence, but only through the treatment failed to completely discharged the stone. 2. Factors that cause stones still exist. Common factors are: (1) lifestyle: drinking less water, some areas of drinking water is hard water, also more likely to form stones; not exercise; diet like to eat food rich in oxalic acid, high protein, high salt, etc.; love to drink beer. (2) Urinary tract infection factors. (3) Metabolic diseases: such as hyperparathyroidism. (4) Urinary obstructive diseases: such as urinary tract stenosis, urinary tract obstruction, ureteral malformation, neurogenic bladder, prostate hyperplasia, etc., so that the urine is retained in the urinary system for too long. If the presence of urinary stones, it is recommended to seek timely medical treatment by a doctor to regulate the treatment, to avoid delaying the condition.