Pelvic effusion is likely to cause abdominal pain, usually in the lower abdomen. After pelvic effusion, it will lead to congestion and edema in the pelvic cavity, and the fluid will stimulate the painful nerves in the pelvic cavity will lead to abdominal pain, and as the fluid disappears, the symptoms can be relieved on their own. The most common causes of pelvic fluid are physiological fluid, such as ovulation, menstruation and pregnancy, which can lead to physiological fluid in the pelvis. If the fluid is pathological, timely treatment is needed, such as pelvic inflammatory disease, uterine adnexitis, and malignant tumors of the reproductive system, all of which can lead to pelvic fluid, requiring timely anti-infection, radiotherapy, chemotherapy, and pain medication if necessary.