Kidney stones and hydronephrosis that occur during pregnancy require specialist management in the hospital, with the advice of an obstetrician and a urologist for collaborative management. 1. If the patient does not have any conscious symptoms and is only found on physical examination then they need to drink a lot of water and urinate more. Most of the stones can be excreted through the ureter, but there are still a small number of patients who have stones that may cause intermittent back pain if they stay for a long time. 2. If the kidney stones and hydronephrosis are further aggravated and cause serious pain or symptoms of infection, it is necessary to consider renal puncture fistula or ureteral stent tube placement, but anesthetic will be used in the process of both operations, which may have some effect on the fetus. If the situation is critical, such as acute obstruction caused by a stone leading to renal failure or infectious shock, termination of pregnancy is necessary to treat the stone or fluid collection.