Women with uterine effusion need to combine the patient’s situation to determine the specific causes, which are mainly seen in the following clinical aspects: First, if the patient does not have normal menstrual flow by the menstrual period, and the ultrasound finds that there is uterine effusion, consider the possibility that the patient has lower cavity adhesions, or cervical canal adhesions, especially when the patient has had an abortion or scraping, this situation should be highly suspected, and the patient can Do cervical dilatation surgery or hysteroscopy to check and confirm the diagnosis; secondly, when the patient has abdominal pain with uterine fluid during non-menstrual period, consider that there may be pelvic inflammatory disease, the patient can do gynecological examination, the uterus will have obvious pressure pain, and there may be purulent or bloody discharge in the cervical canal; thirdly, when the patient has normal menstrual period, it is normal to do ultrasound to show that there is uterine fluid, and the exfoliated endometrium and blood, a small part of which will stay in the uterine cavity and be expelled under the contraction of the uterus; fourthly, if fluid in the uterus appears after pregnancy, the possibility of pre-eclampsia is considered, and timely examination and birth control are needed.