The lower edge of the placenta at 28 weeks is too low from the endocervical os should mean placenta praevia, the etiology is not very clear, the high risk factors are endometrial damage, multiple pregnancy or assisted reproduction technology and other reasons.
1. Endometrial damage: A history of multiple miscarriages, curettage, cesarean section or uterine surgery can damage the endometrium. When a fertilized egg implants in the damaged endometrium, the placenta often extends to the lower part of the uterus in order to take in enough nutrients, which results in placenta praevia.
2. Multiple pregnancies: Since twin pregnancies have a larger placental area than single pregnancies, the placenta often extends to the lower part of the uterus in order to obtain nutrients, resulting in placenta previa.
3. Assisted Reproductive Technology: As the use of ovulation stimulating drugs can change the hormone level in the body, making the development of endometrium and embryo development out of sync, and inducing contractions during artificial implantation of the fertilized egg, it can lead to the fertilized egg being deposited in the lower segment of the uterus, resulting in placenta praevia.
Risk factors for placenta previa include advanced age, bad lifestyle habits, and infections. It is recommended to go to the hospital in time for a complete examination to determine the cause of the disease and then give targeted treatment or therapy under the guidance of the doctor.