Red leukorrhea is common for the following reasons: 1, postmenopausal women with red leukorrhea, on the one hand, consider the bloody leukorrhea caused by senile vaginitis, and on the other hand, consider the abnormal bleeding symptoms caused by reproductive system neoplastic diseases. It is necessary for the patient to go to the gynecology department of the hospital for routine laboratory examination of leukorrhea, gynecological ultrasonography and gynecological internal diagnosis to further confirm the diagnosis.2. Some women have bloody leukorrhea after sex, and polyps, cancers, erosions, and other lesions of the cervical area will cause blood in the leukorrhea after sex. Polyps of the endometrium, inflammatory lesions, malignant tumor lesions, can also cause bleeding leukorrhea after sex. Excessive friction and stimulation of the vaginal wall during sex, resulting in congestion and edema of the vaginal wall, may also appear with blood in the leukorrhea. 3, the phenomenon of blood in the leukorrhea that occurs in the middle of the two menstrual cycles is considered to be due to the lack of estrogen level caused by ovulation bleeding.