Is the hydronephrosis serious?

The key to whether hydronephrosis is serious depends on whether the obstruction of the lower urinary tract that causes hydronephrosis is serious. If the urinary tract obstruction is severe and completely blocks the urinary tract passage, then hydronephrosis is serious. If the urinary tract is not completely blocked, but is only narrow or not very unobstructed, then hydronephrosis is not very serious for the time being. But in either case, you need to go to the urology department for active treatment to relieve the obstruction. If the ureteropelvic junction is narrow, then it is necessary to comprehensively determine whether the extent of the stenosis causes severe hydronephrosis. If it is only mild stenosis, then most of the renal pelvis urine can still flow smoothly downward, so surgery may not be performed temporarily. If ureteral calculi cause obstruction in the upper urinary tract of the entire ureter, resulting in ureteral hydrops and hydronephrosis, then the obstruction is dead, and surgery must be performed in time to remove obstruction and protect kidney function.