The main reasons for vaginal bleeding and back pain are endocrine disorders, IUDs and pelvic inflammatory disease. 1. Endocrine disorders: climate change, mental stress and medication can lead to endocrine disorders and menstrual back pain. In this case, patients need to eliminate the causes, to ensure sleep, work and rest; 2, IUD: IUD wear too long, size and the cavity of the uterus, etc., can lead to displacement of the device, stimulating the uterine cavity to produce inflammation, which leads to abdominal pain, bleeding and other symptoms. Patients should go to the hospital to have it removed and should avoid intercourse during this period to avoid germ infection. 3. pelvic inflammatory disease: due to retrograde germs, the pelvic cavity becomes inflamed with edema, exudation, adhesions and other symptoms, which in turn leads to back pain, vaginal bleeding and abnormal discharge. When there is gynecological inflammation, patients are advised to follow medical advice and apply antibiotic treatment in a timely manner, in addition to laser and microwave physiotherapy. During this period, patients should pay attention to personal hygiene, change underwear and underwear regularly to prevent aggravating infection. 4. Other: adenomyosis and ovarian cysts can also cause vaginal bleeding.