The treatment strategy for ureteral obstruction is generally to relieve the obstruction and restore patency of the ureter. What is ureteral obstruction? The ureter is the tube of the urinary system that carries urine produced by the kidneys to the bladder. When there is compression of the ureter or an occupancy or stenosis in the lumen, fluid accumulation in the upper ureter and the renal pelvis will occur, which is called ureteral obstruction. The etiology of ureteral obstruction mainly includes ureteral tumor, tumor from other sources compressing the ureter, ureteral stone, and medical origin injury. For ureteral obstruction caused by different reasons, the treatment modalities are different. For malignant ureteral tumors, radical surgery to remove the full length of the ureter of the affected kidney is currently the main approach. Ureteral stones are still mainly lifted. Currently, ureteroscopic laser lithotripsy and extracorporeal lithotripsy are the treatment modalities, and stones smaller than 0.6 cm can be expelled from the body by themselves. After ureteroscopy and laser lithotripsy, ureteral double-J tube can be placed to drain and dilate the ureter, and balloon dilation can be performed for severe stenosis. For ureteral obstruction caused by external compression, in addition to relieving the original disease, the placement of ureteral double-J tube is less damaging and can be the first choice. Of course, the ureteral obstruction in some people is more complicated, and it is more difficult to solve the obstruction in the first stage, so nephrostomy will be chosen first to release the fluid, and the appropriate treatment plan will be chosen in the second stage. In summary, once ureteral obstruction occurs, it is still recommended to go to the hospital to improve ultrasound, CT, urinary routine and other tests to clarify the cause of ureteral obstruction, timely symptomatic treatment, long-term ureteral obstruction without treatment will cause severe hydronephrosis, which may cause renal cortical atrophy.