If right hydronephrosis occurs during pregnancy, it is recommended to go to the hospital for further examination to clarify the extent of the hydronephrosis and its cause and then treat it symptomatically.1. The enlargement of the uterus during pregnancy can cause compression of the right ureter and lead to right hydronephrosis. If the patient has right hydronephrosis, he can sleep in the left side position, and regular outpatient review to observe the changes in the amount of hydronephrosis, as long as there are no symptoms and the amount of hydronephrosis does not increase significantly, it is recommended to wait for dynamic review after delivery, and temporarily do not need any treatment. 2, if there are ureteral stones, kidney stones caused by right hydronephrosis, usually drink more water, urinate more, if the volume of stones is relatively small 6mm or less It is recommended to drink more water and exercise for stone removal treatment. If the stone volume is larger with obvious pain, it is recommended to perform ureteral stent tube placement and wait for further treatment of the stone lesion after delivery.3. If right hydronephrosis exists during pregnancy, it is considered to be caused by congenital disease, it is recommended to observe dynamically and not to deal with it during pregnancy and wait for retrograde imaging or surgery after delivery.