Ureteral stenosis after stenting the kidney and fluid considerations are due to urinary tract infections, urinary tract stones, benign prostatic hyperplasia and other factors. 1. Urinary tract infection: such as pyelonephritis, ureteritis, etc., the patient can be due to the scar after the inflammation of the narrowing, resulting in the obstruction of urine discharge, the occurrence of hydronephrosis. 2. Urinary stones: such as bladder stones, urethral stones, etc., can cause obstruction of the urinary tract, which can lead to poor urination and cause hydronephrosis. 3. Benign prostatic hyperplasia: in the early stage of benign prostatic hyperplasia, the symptoms are atypical due to compensation, with the lower urinary tract obstruction aggravated, the symptoms are gradually obvious, the clinical symptoms include the symptoms of the storage period, the symptoms of the voiding period and the symptoms of the post urinary symptoms. If it causes urinary retention, then it can also cause hydronephrosis. In addition, penile, scar formation after surgery can also cause ureteral stenosis after stenting kidney with fluid, it is recommended to consult a doctor in time, to clarify the cause of the disease, and then to carry out the treatment of the cause.