Bilateral mild hydronephrosis, then you need to go to the hospital for examination to clarify the cause of the hydronephrosis to treat it symptomatically: 1. If the hydronephrosis is due to long-term urinary retention resulting in reflux, you need to first indwelling a catheter or perform suprapubic cystocentesis fistula drainage, so that the hydronephrosis can be gradually relieved or restored to normal. The most common cause for men is urinary retention due to prostatic hyperplasia, which can be complicated by mild bilateral hydronephrosis, which requires prostate surgery for complete cure. 2. Women are mostly considered to be caused by neurogenic bladder or bladder prolapse and other diseases. If necessary, a permanent suprapubic cystotomy or pelvic floor reconstruction surgery may be given. In women, it can also be seen that gynecological tumors compress the ureters bilaterally, causing mild hydronephrosis in the kidneys bilaterally. Routine gynecological ultrasound or gynecological examination is needed, and if gynecological diseases exist, treatment in gynecological specialists is required.