A pelvic effusion of 4.0 cm is more serious and indicates a large amount of exudation due to chronic pelvic inflammatory disease. Without timely intervention, it is likely to cause adhesions in the pelvic tissues leading to recurrent lower abdominal pain, or adhesions in the fallopian tubes resulting in infertility. It is clinically recommended to give broad-spectrum antibiotics in combination with metronidazole or tinidazole for the treatment of anaerobic bacteria, administered intravenously for one week. During the period of medication, no spicy, acidic or stimulating food should be eaten and no sexual intercourse should be allowed. In addition, microwave therapy can also be combined to promote the absorption of inflammation through the heat circulation in the lower abdomen. In addition, during the treatment period, it is necessary to enhance nutrition, such as protein and vitamin supplements.