Pelvic effusion in 70-year-old people may be physiological factors, such as pelvic or abdominal organ secretion retention; there may also be pathological reasons, such as inflammation of abdominal organs, pelvic inflammatory disease, tumors and so on. 1. Physiological: if the pelvic fluid is physiological, usually there is no organ lesion, it is caused by the retention of fluid secreted by pelvic or abdominal organs in the pelvic cavity, usually the amount is relatively small and will be absorbed on its own, and it will not have any special effects. 2. Pathological: If the pelvic effusion is pathological, it is caused by organic lesions, such as inflammation of abdominal organs, pelvic inflammatory disease or tumors, which may also cause lower abdominal pain and elevated body temperature, etc. Therefore, if the examination reveals pelvic effusion, it is usually caused by no organ lesions. Therefore, if pelvic fluid is found on examination, it is necessary to complete the examination, make a clear diagnosis, and treat under the guidance of the doctor to avoid serious consequences.