The main way to check for pelvic effusion is, first, to perform an ultrasound examination of the pelvis. Secondly, a gynecological examination is performed. It is possible to learn that the rectal uterine trap is full and a posterior vaginal vault aspiration can be performed to draw out fluid, which will clarify pelvic effusion. There are many causes of pelvic effusion, such as physiological pelvic effusion, which is mainly caused by physiological pelvic congestion and edema, and is mainly seen during ovulation, as well as during menstruation and early pregnancy. Pathological pelvic effusion is mainly seen in patients with pelvic inflammatory disease, ectopic pregnancy rupture and bleeding resulting in pelvic effusion, and pelvic effusion caused by tumors of the reproductive system, most commonly in patients with ovarian cancer and cervical cancer. Patients with pelvic effusion mainly experience pain in the small abdomen, mainly swelling and pain, and may develop fever, which can be alleviated by resting in a semi-recumbent position.