During pregnancy and childbirth, the amount of sex hormones in women has relatively large changes, causing the menstrual cycle to change according to: shorter, longer or irregular as before pregnancy... One of the most common changes is menorrhagia after cesarean section.

Currently, the situation of old cesarean scar defect is increasing due to the high cesarean section rate of 40-60% in Vietnam. Up to now, there is still much debate about how to have an optimal cesarean section and limit the consequences. If old cesarean scar defect does not cause wound seroma, does not leak fluid in the uterine cavity affecting the implantation of the fetus, then it is highly likely not secondary infertility.