What are the causes of placenta previa

summary

A pregnant woman friend of mine often has painless repeated vaginal bleeding without inducement during labor. She accompanied her to the hospital for prenatal examination and found that the placenta attached to the lower uterine segment. The doctor said it was caused by placenta previa. Let's talk about the causes of placenta previa.

What are the causes of placenta previa

First: Endometrial damage, which is the main cause of placenta previa, such as women who have undergone cesarean section, artificial abortion, hysteromyoma surgery, the endometrium and grass-roots will be damaged, the local blood supply after pregnancy is poor, the fetus in order to get more nutrition, the placenta will automatically increase the area, so as to cover the mouth of the uterus, forming a placenta previa state.

Second: endometrial lesions in the uterine body, such as puerperal infection, prolificacy, multiple curettage and cesarean section, cause endometritis or endometrial damage, which leads to incomplete growth of decidual blood vessels. When the fertilized egg is implanted, the blood supply is insufficient. In order to absorb enough nutrition, the placenta area is expanded and extended to the lower uterine segment.

Third: placental abnormalities: such as the placenta, the main placenta in the uterine body, and the placenta can reach the lower uterine near the cervical orifice. Trophoblast growth retardation: when the fertilized egg reaches the uterine cavity, it does not develop to the stage of implantation, but continues to move down and implant into the lower uterine segment, where it grows and develops to form placenta previa.

matters needing attention

Pregnant women are generally more vulnerable, so during pregnancy should pay more attention to their own health, there is to have good living habits, do not smoke, do not drink, there is also a pregnant woman in the living environment should be relatively clean and hygienic, to avoid the generation of other viruses, seriously do a good job in family planning, avoid repeated abortion.