Normally, pelvic fluid does not usually increase before menstruation, but if there is inflammation of the reproductive system itself, pelvic fluid can form. There is usually no pelvic fluid before menstruation, but usually in the middle of the menstrual cycle, when the ovaries ovulate, the follicular fluid flows into the pelvis will form a certain amount of pelvic fluid, but not a lot. However, if pelvic fluid is found during physical examination, accompanied by radiating pain in the lumbosacral region and discomfort in the lower abdomen, it is often considered that pelvic inflammatory disease may be present. Therefore, when pelvic fluid is found, you should also pay more attention to your own symptoms, and if you have any uncomfortable symptoms, you should consult a doctor in time to find out the cause of the disease and then treat it under the guidance of the doctor.