Retroperitoneal ureteric fibrosis is a fibrous proliferation of the retroperitoneal space that may compress the ureter and lead to hydronephrosis, and the diagnosis is based on symptoms and imaging tests. The exact cause of retroperitoneal ureteric fibrosis is unknown. It may be related to smoking or taking certain medications, such as dopamine agonists, which leads to chronic inflammation, resulting in tissue fibrosis. It can compress the ureter, leading to low back pain, pyelonephrosis, blood in the urine, oliguria, edema, etc. The diagnosis can be confirmed by enhanced CT of the abdomen. If you suspect retroperitoneal fibrosis, you should go to the hospital in time to improve the relevant examination, and under the guidance of the doctor for treatment to protect the renal function.