Ureteral stone 13mm is more serious, usually can’t be discharged by itself, may cause severe lower back and abdominal pain, and in serious cases, it may also cause hydronephrosis, which may cause damage to the kidneys, and it is recommended to have further treatment. Ureteral stone 13mm indicates that the diameter of ureteral stone is large, usually can not be discharged by themselves, may be stuck in the ureter, causing damage to the ureteral wall, can cause severe lower back and abdominal pain, hematuria, nausea, vomiting and other symptoms. As the ureter is blocked by the stone, the urine can not be discharged, may cause hydronephrosis, urinary tract infections and other complications, and in serious cases can lead to renal insufficiency and the affected side of the renal failure, therefore, ureteral stone 13mm is more serious. If the diameter of ureteral stone is 13mm, you should carry out appropriate lithotripsy treatment under the guidance of doctor, according to the location of the stone, the degree of obstruction, with or without co-infection, choose extracorporeal shock wave lithotripsy, ureteroscopy lithotripsy, ureteroscopic lithotripsy or percutaneous nephrolithotripsy, etc., to prevent causing serious complications.