Clinically, if kidney stones are found in pregnant women in mid-pregnancy, they are treated conservatively if they do not lead to severe hydronephrosis, cause damage to kidney function or are large enough to form cast stones and cause serious urinary tract infection or damage to kidney function. Ureteral stenting can be routinely performed to facilitate urine drainage and prevent the accumulation of urine from the kidney in the renal pelvis to cause kidney damage. If the kidney stone is small and enters the ureter, it can be treated symptomatically with methotrexate injections to dilate the ureter and maintain sufficient water intake to allow the stone to pass out of the body. If the stone has been stuck in the ureter for a long time, a ureteral stent tube should be inserted to push the stone into the renal pelvis and then lithotripsy should be performed after delivery. Surgery is not recommended in the middle of pregnancy because it can affect the growth and development of the fetus.