The increase in leukorrhea after sex may be caused by physiological phenomenon, vaginal inflammation, cervical inflammation, pelvic inflammatory disease and other reasons. 1. Physiological phenomenon: cervical glands and vestibular glands increase secretion during intercourse, these mucus and leukorrhea are mixed together and discharged, manifested as increased leukorrhea after intercourse, not accompanied by other discomforts, mostly considered to be a normal physiological phenomenon. 2. Vaginal inflammation: it can also be manifested as increased leukorrhea after sexual intercourse, accompanied by vulvar itching, burning or painful sensation in the vulva and vagina, etc. The pathogens can be clarified through the examination of vaginal secretion, and the active treatment is in accordance with the doctor’s instructions. 3. Cervical inflammation: it can also cause leukorrhea to increase after sex, mostly yellowish or purulent, and can be accompanied by vulvar itching, gynecological examination can be seen at the mouth of the cervix pus discharge, can be combined with the clinical manifestations and gynecological examination, vaginal secretion examination to assist in the diagnosis. 4. Pelvic inflammatory disease: such as endometritis, uterine myositis, etc., there is also an increase in leukorrhea after sex, purulent, and may be accompanied by persistent pain in the lower abdomen, uterine tenderness or adnexal pressure, combined with the history, signs and laboratory tests can assist in the diagnosis. There may be other reasons for the increase in leukorrhea after sex, so it is recommended to go to the hospital in a timely manner to identify the cause under the guidance of the doctor and deal with it in a timely manner.