First, let’s explain what pelvic fluid is: Because the pelvic cavity, especially the depression between the back of the uterus and the rectum, is the lowest part of the abdominal cavity in the body, when fluid is present, it will flow to this area, and a dark area of fluid will be seen during ultrasound examination. The ultrasonographer will measure and give a diagnosis of “pelvic fluid” along with a depth value. The fluid may be water, blood, or pus. Does pelvic fluid need to be treated? The first thing to determine is whether it is physiological or pathological. 1. Physiological pelvic fluid. The normal physiological condition of the peritoneal cavity is 100-200 ml of plasma peritoneal fluid, and the chance of finding peritoneal fluid in the rectal fossa of the uterus on ultrasonography is significantly higher in women than in men. Therefore, if no other problems are found, it should be normal to find only a small amount of peritoneal fluid on examination; in addition, some normal women will have a small amount of blood accumulating in the pelvic cavity during menstruation or ovulation, forming pelvic fluid, and the fluid in such pelvic fluid is generally less and will be gradually absorbed, and generally no treatment is needed. 2.Pathological pelvic fluid. Some diseases can cause pelvic effusion: acute and chronic inflammation of the pelvis, tumor, tuberculosis, ectopic pregnancy, rupture of corpus luteum, etc. The specific diagnosis requires a doctor to combine the patient’s symptoms, signs and other tests to make a comprehensive judgment. The advice I would like to give here is: if you see “pelvic fluid” in the ultrasound report, the depth is about 1cm, there are no uncomfortable symptoms, and there are no obvious abnormalities in other examinations, you can avoid treatment (if a doctor diagnoses pelvic inflammatory disease just because he sees a small amount of pelvic fluid, he can only say that he is not professional enough); if there is abdominal pain, fever If there are symptoms such as abdominal pain, fever, or abnormal findings in other tests, it is up to the doctor to determine whether further tests and treatment are needed.