Depending on the material of the stent tube, it can be left in the body for different periods of time. Generally, ureteral stent tubes made of ordinary materials can be left in the body for about 3 months; there are also some stent tubes made of special materials, usually imported stent tubes, which can be left in the body for about 12 months at most. Ureteral stent tubes are commonly used in urological surgeries, often used in kidney stone and ureteral stone surgeries, and also used to drain hydronephrosis, especially hydronephrosis caused by ureteral stenosis. Ureteral stent tubes can guarantee the smooth drainage of urine from the kidney into the bladder. Ureteral stent tubes should be replaced in time, otherwise it will cause some complications such as stones, hematuria, pain, etc., which is not conducive to the recovery of the condition. It is recommended that patients with hydronephrosis should go to regular hospitals in time for consultation and treatment, and the doctors should make specific treatment plan according to their specific conditions. If necessary, ureteral stenting tube placement should be operated by professional doctors, and if there is any discomfort after the operation, they should follow up the consultation in time.