The common causes of uterine fluid are poor uterine recovery after abortion, induced abortion, uterine cleansing surgery, or after childbirth, in which the blood in the uterine cavity cannot be discharged in time, and fluid can be found through ultrasound, or fluid can be found through the examination of uterine pus. The main causes of pelvic effusion are due to chronic pelvic inflammatory disease that leads to tissue exudation, so effusion is formed or due to luteal rupture, or due to ectopic pregnancy tubal rupture. It is recommended that treatment be based on the history of the case, the clinical findings, and the results of laboratory tests.