Uterorectal fossa fluid accumulation is generally small amount of no symptoms, the amount of fluid accumulation may appear lower abdominal distension, lumbosacral pain symptoms. 1. No symptoms: Uterorectal fossa fluid may be caused by physiological reasons, is the follicular fluid after ovulation or pelvic organs secreted by the interstitial fluid caused by the general amount of fluid is not more than 2cm, with the changes in the menstrual cycle may be absorbed or disappeared, there will be no obvious symptoms, and do not have to be special treatment. 2. Lower abdominal distension: the amount of fluid in the uterorectal fossa is relatively large and may be purulent exudate, and these fluids stimulate pelvic congestion and edema may cause lower abdominal distension. 3. Lumbosacral pain: more fluid in the uterorectal fossa may be caused by pelvic inflammatory disease, pelvic connective tissue by Neisseria gonorrhoeae or anaerobic bacteria and other bacterial infections will occur inflammatory lesions, stimulation of inflammation leads to pelvic venous plexus congestion and edema, the entire pelvic blood reflux is impeded, there may be a lumbosacral pain. For severe cases of uterorectal fossa effusion, prompt medical treatment is recommended.