The reasons why women experience back pain on the sixth day after IVF transplantation are as follows: First, it may be due to the fact that women lie flat on the bed for a longer period of time after the transplantation, and the back pain occurs. Second, it may also be related to the use of progesterone drugs, because women will be given progesterone drugs after IVF in order to reduce the rejection reaction of the endometrium to the embryo so that the uterine smooth muscle relaxation. Drugs not only make the uterine smooth muscle relaxation, may also lead to relaxation of the nerves in the waist, so there will be back pain. Third, there may be a woman’s own waist there are lesions can also lead to back pain, when women in the 6th six months after transplantation back pain does not have lower abdominal pain, vaginal bleeding, you can temporarily observe, if necessary, you need to go to the hospital for further examination in order to clarify the cause of the corresponding treatment.