Pelvic fluid with 25 mm may have inflammation, mostly seen in pelvic inflammatory disease, but also due to other pathologic factors such as luteal rupture and ectopic pregnancy. 1. Pelvic inflammatory disease: this disease is mainly infected by pathogenic microorganisms, such as Chlamydia trachomatis, Staphylococcus aureus, hemolytic streptococcus and so on. It can be induced by sexual activity, poor hygiene and other factors, leading to abdominal pain, fever and other symptoms in patients. Because the plasma in the inflammation area can not be absorbed by the organism, it will spread to the pelvis, resulting in 25 millimeters of fluid in the pelvis. 2. Rupture of corpus luteum: the occurrence of this disease is mainly related to external force, abnormal blood clotting function, corpus luteum cyst formation and other reasons. Patients will have abdominal pain, vaginal bleeding and other symptoms, which will easily cause pelvic bloody effusion, followed by 25 millimeters of pelvic effusion found through examination. 3. Ectopic pregnancy: it is mainly related to tubal inflammation and dysplasia, followed by contraceptive failure, multiple sexual partners, smoking and so on. When the embryo grows to a certain extent, it will lead to tubal rupture, and the patient will have vaginal bleeding, abdominal pain, and the blood will collect in the rectal uterine depression, and it will also spread to the abdominal cavity, and then there will be pelvic effusion with 25 millimeters. Therefore, there are many reasons for pelvic effusion of 25 millimeters, not necessarily due to inflammation, you need to go to the hospital to do the relevant examination to clarify the specific causes.