The inability to urinate in the kidneys is usually caused by prostate hypertrophy, kidney tumors and other causes, which can be given treatment such as catheterization surgery. If the patient has an enlarged prostate gland that causes urinary inaccessibility and reflux to the kidneys, the renal pelvis and renal calyces become dilated, causing fluid retention in the kidneys. The first thing to do is to give a catheter to get the urine out, and you can take oral tamoxin extended-release tablets and other medications with the treatment. If the patient repeatedly has symptoms such as inability to urinate because of the prostate enlargement, you can give prostatectomy treatment, and the water in the kidney will disappear after the prostate is removed. If the patient has a kidney tumor that can lead to ureteral obstruction and cause hydronephrosis, then surgery is needed to remove the tumor and release the obstruction, and the hydronephrosis will disappear naturally.