Ultrasound of the uterine adnexa is not abnormal but abnormal vaginal bleeding is due to endocrine disorders, trauma, preeclampsia, gynecological inflammation and other reasons. 1. Endocrine disorders, endocrine disorders cause the ovaries to secrete less estrogen, estrogen, progesterone imbalance, thus triggering irregular vaginal bleeding. 2. Trauma, women’s vulva when there is an injury or a foreign body, can lead to bleeding, trauma caused by bleeding is usually damage bleeding, pain is more obvious. 3. Miscarriage, if there is a history of sexual intercourse, we should consider whether the bleeding is caused by miscarriage, it is recommended to check the urine pregnancy test or blood test to do HCG examination to clarify the cause of the cause of the problem, because the gestational sac can not enter the uterine cavity before 6 weeks of conception, so that ultrasound can not be seen, and blood tests are required to do. 4. Gynecological inflammation, such as vaginal inflammation, cervicitis, pelvic inflammatory disease, etc., due to pathogen infection, the imbalance of the vaginal flora, vaginal wall and cervix congestion, edema, sometimes affected by contact, easy to ulceration, bleeding and other symptoms. Other related causes, such as polycystic ovary syndrome, cervical cancer and other diseases, also easily lead to vaginal bleeding. Therefore, patients with the above symptoms should go to the hospital in time, and be diagnosed by a professional doctor and treated according to the cause.