During pregnancy, a woman’s enlarged uterus can compress the bladder and ureter, which can slow the flow of urine and lead to the formation of urinary stones. Kidney stones can be localized with more intermittent vague pain, but if there is an increase in intermittent pain, it is possible that the stone has entered the ureter. Once the stone rubs against the ureteral wall, more intense pain can occur, which can easily lead to renal colic. This is mainly because the stone is moving downwards and the ureter and has a unidirectional peristaltic action that pushes the stone towards the bladder. As a result, painful symptoms can occur intermittently. In case of stones during pregnancy, the patient should promptly have a urinary ultrasound to clarify the hydronephrosis and to know the size and number of stones. If there is more serious hydronephrosis, ureteroscopic double J-tube placement should be performed promptly to relieve renal function damage caused by obstruction. If the stones are small in diameter, you should keep drinking plenty of water and this problem can usually be solved after the stones are emptied into the bladder.