Pelvic fluid is divided into physiological pelvic fluid and pathological pelvic fluid, the depth of physiological pelvic fluid <20mm, and the depth of pelvic fluid up to 30mm belongs to pathological. 1. Physiological pelvic fluid: physiological pelvic fluid is formed during menstruation and ovulation, which is a physiological phenomenon. It is mainly caused by the follicular fluid flowing out into the pelvis after ovulation, and pelvic fluid will be formed, which is often manifested as pain in the lower abdomen and lumbar pain, etc. Physiological pelvic fluid can be absorbed on its own, so there is no need to worry about it too much. 2. Pathologic pelvic fluid: Pathologic pelvic fluid is caused by pelvic inflammatory disease, corpus luteum rupture, etc., manifested as lower abdominal pain, high fever, chills, abdominal pain, a feeling of falling, fainting, shock, etc., if the pelvic inflammatory disease, oral antibiotics such as levofloxacin, clindamycin, etc., if it is caused by the rupture of corpus luteum, it should be timely for surgical treatment. Pathological pelvic effusion of 30mm, if accompanied by physical discomfort promptly seek medical treatment under the guidance of a doctor.