There is no such thing as the five major dangers of nephrostomy. Nephrostomy is a minor surgery to drain the renal pelvis, which can reduce the infection of the renal pelvis and renal parenchyma, and improve the renal function. Postoperative nephrostomy may also cause bleeding, injury and infection, but the overall risk is small. Nephrostomy can be used to treat ureteral obstruction that is difficult to remove in time. The obstruction can cause fluid in the renal pelvis, which may lead to impaired renal function or uremia if the nephrostomy is not performed in time. Nephrostomy can cause bleeding during puncture; at the same time, nephrostomy surgery also has the risk of infection if not properly cared for; if nephrostomy is not properly operated, there is also the possibility of secondary injury. Overall nephrostomy is a common surgical procedure used in ureteral obstruction, and the surgical risk is relatively small. Patients should go to a regular hospital for nephrostomy to minimize the risk.