Healthline explains that treatment for hydronephrosis is intended to relieve the obstruction causing the problem. A blocked ureter might be treated by inserting a stent, or a blockage caused by a kidney stone, blood clot or scar tissue might need to be surgically removed.
According to Healthline, hydronephrosis is a condition characterized by swelling of a kidney due to an obstruction of the flow of urine. Symptoms include urinating more frequently, pain and development of a urinary tract infection. If left untreated too long, hydronephrosis can cause permanent kidney damage. The most common cause of hydronephrosis is a kidney stone lodged in the ureter.