What Is Placenta Previa?
Placenta previa is a condition during pregnancy. In this condition, the placenta covers part or all of the cervix. The cervix is the opening to the uterus. Because of this, placenta previa can cause problems during pregnancy and delivery. Understanding the causes of placenta previa helps you know your risks.
Why Does Placenta Previa Occur?
Doctors do not always know the exact causes of placenta previa. However, certain factors can increase your risk. These are called risk factors for placenta previa. Some women have more than one risk factor. Still, many women with risk factors never develop this condition.
Main Causes and Risk Factors for Placenta Previa
Placenta previa can happen for several reasons. Below are the most common causes and risk factors:
Previous C-section: If you had a cesarean section before, your risk increases. Scar tissue from surgery may affect where the placenta attaches.
Previous placenta previa: If you had placenta previa in a past pregnancy, you are more likely to have it again.
Multiple pregnancies: Carrying twins or more can raise your risk. More placentas or a larger placenta may cover the cervix.
Older age: Women over 35 have a higher chance of placenta previa. Age can affect how the placenta attaches.
Smoking: Smoking during pregnancy increases the risk. Chemicals in cigarettes may affect the uterus and placenta.
Uterine surgery: Any surgery on the uterus, such as removing fibroids, can increase risk. Scar tissue may change where the placenta grows.
High number of pregnancies: Women who have had many pregnancies are at greater risk. The uterus changes with each pregnancy.
In vitro fertilization (IVF): IVF pregnancies may have a higher risk. The reason is not fully clear, but it may relate to how the embryo implants.
How Do These Risk Factors Cause Placenta Previa?
Usually, the placenta attaches to the upper part of the uterus. Sometimes, changes in the uterus make the placenta attach lower. For example, scar tissue from surgery or past pregnancies can affect where the placenta grows. As a result, the placenta may cover the cervix. In addition, lifestyle factors like smoking can change the way the placenta develops.
Summary of Key Points
Placenta previa happens when the placenta covers the cervix.
Common causes include previous C-sections, older age, and multiple pregnancies.
Other risk factors are smoking, uterine surgery, and IVF.
Not all women with risk factors will get placenta previa.
Knowing your risk can help you talk with your doctor.
If you have concerns about placenta previa, consult a healthcare specialist for personalized advice.
