There are several reasons for pelvic effusion during pregnancy: first, it may be a physiological phenomenon, as the pelvic congestion during pregnancy leads to more exudate, so the problem of pelvic effusion will appear, after a period of time may disappear on its own, do not worry too much. Second, it may also be caused by disease factors, such as inflammatory reactions during pregnancy, which can lead to pelvic effusion, go to the hospital for examination in time to see if there is lower abdominal distension and pain, to understand the source of pelvic effusion, and then for symptomatic treatment. If it is caused by inflammation, it is best to carry out anti-inflammatory treatment in a timely manner, which will allow the pelvic fluid to slowly decrease. It may also be caused by other diseases, such as malignant tumors, which require timely symptomatic treatment.