1.Ureteral stent tube, also called double J tube, and also called pig tail tube because of its resemblance to pig tail. It is suitable for the drainage of hydronephrosis after ureteroscopy and percutaneous nephrolithotomy, temporary obstruction caused by ureteral inflammation and edema, long-term obstruction caused by ureteral stricture and narrowing, drainage after ureteral injury, etc. 2. The discomfort symptoms caused by the indwelling ureteral stent tube are as follows: a. Lower urinary tract irritation symptoms, such as urinary frequency and urgency, painful urination, hematuria, and discomfort of lower abdomen and bladder area. b. Soreness and swelling discomfort in the lower back caused by holding urine. c. Severe hematuria, renal colic and fever, please go to the urology department of local hospital in time. Zhang Dongpeng, Department of Urology, Tianjin Hospital 3. Precautions after indwelling ureteral stent tube: a. Drink more water and keep urine volume around 2000ml. b. Do not hold urine for a long time, causing urine ureteral reflux causing back pain and discomfort c. Avoid strenuous activities of the waist and abdomen. d. If there are slight lower urinary tract irritation symptoms and hematuria during the period with the tube, there is no need to be particularly worried, as drinking water and taking oral anti-inflammatory drugs can generally improve. e. Unless the ureteral stricture, medical advice requires long-term double J tube, regular replacement; generally January after surgery to the urology department of the hospital where the tube is placed, pull out the double J tube, so as to avoid stone formation, resulting in double J tube difficult to pull out.