Pelvic fluid may be caused by pelvic inflammatory disease, rupture of corpus luteum, ectopic pregnancy and other diseases, which may cause high fever, abdominal pain, nausea and other symptoms. 1. Pelvic inflammatory disease: Acute pelvic inflammatory disease may lead to high fever, chills, lower abdominal pain and other symptoms. Chronic pelvic inflammatory disease manifests itself as vague pain in the lower abdomen, which is aggravated after sexual intercourse or activities, and some patients may have lumbago. 2. Rupture of corpus luteum: If the lower abdomen is hit before menstruation, or coughing hard, strenuous exercise, etc., it is easy to cause corpus luteum rupture, which can suddenly appear on one side of the lower abdominal pain, and after a short time it will be persistent crushing pain, which will be gradually reduced or aggravated. 3. Ectopic pregnancy: most patients with ectopic pregnancy will have a history of menopause, ectopic pregnancy rupture, the patient will often suddenly feel a tearing pain in the lower abdomen, accompanied by nausea and want to vomit, after the embryo stops, there will often be a small amount of vaginal bleeding. In severe cases, fainting or shock may occur. If the above situation occurs, it is recommended to go to the hospital in time, to clarify the cause of treatment.