A cesarean section is an operation that delivers a baby through a cut in your abdomen and uterus. The uterus is the muscular organ at the top of the vagina.
Babies develop in the uterus, and menstrual blood comes from the uterus.
If you have had a previous operation on your uterus, such as a cesarean section or myomectomy, your uterus has a scar. Because scar tissue is weaker than muscle, the scar from your previous operation might open during labor. If it opens, it endangers you and your baby. It is very rare for a scar to open if it is from a previous cesarean section in which the cut was made across the uterus. However, if you had a cesarean section with a vertical cut in your uterus, or a myomectomy that went through your uterine wall, the risks are higher.