Some women will have back pain after sex, this is how it is, mainly due to the following reasons: 1, pelvic inflammatory disease, suffering from pelvic inflammatory disease is the main cause of back pain during or after sex. 2, endometriosis, is the cause of menstrual dysmenorrhea symptoms, abdominal pain after sex, and lower back pain of the common diseases. 3, cervical disease, suffering from celiac disease, cervical hypertrophy and other chronic cervical inflammatory diseases, under the stimulation of sex will also cause abdominal pain and back pain after sex. 4, intrauterine placement of birth control rings, part of the uterine cavity will also cause abdominal pain and back pain during or after sex. When suffering from chronic inflammatory diseases of the cervix such as cervical erosion and cervical hypertrophy, the stimulation of sex will also cause abdominal pain and low back pain during and after sex. 4, the uterus placed in the birth control ring, some of the uterus placed in the birth control ring of the women, in the stimulation of sex will be due to the uterus and pelvic congestion, which will lead to symptoms of low back pain. The causes may not be exactly the same for different individuals, and proper examination is required to determine this.