3 Need to Know Facts on Pregnancy and Fibroids Location

Have you ever wondered about problems with pregnancy and fibroids? When you learn that you have fibroids, it means that you have a non-cancerous tumor in your uterus. And, since your uterus is a large, layered organ, we classify and name fibroids based on where in your uterus they develop.

In case you need a review: your uterus has three layers: the outer serosa; the middle, muscular myometrium; and the inner lining—the endometrium. This endometrium is the lining that you shed each month during your period.

Now that you’ve got the anatomy down, we’ll get to classifying fibroids. There are three different types of fibroids.
1. Uterine fibroids that develop beneath the outside covering of the womb are called sub-serosal.

2. If they form in your uterine muscle, they are intramural.

3. And if fibroids pop up in your uterine cavity, inside the endometrium, they are submucosal.

Many women find it difficult to become pregnant while they have untreated fibroids. But, if you do become pregnant, the location of your fibroids can make a major difference in your ability to carry your child to term.

Sub Mucosal Fibroids and Pregnancy

When it comes to pregnancy and fibroids, tumors that develop in your womb can have the greatest impact on your pregnancy. If the fibroid is large enough to change the shape of your womb, you may experience pregnancy complications. Common side effects include, spotting and pain. Your fetal growth could be limited, because fibroids take up too much space in your uterus. With pregnancy and fibroids, your risk for premature delivery and miscarriage also increases. And during your pregnancy, you’re also at risk for placental abruption (when your placenta detaches from your uterus.)

In some cases, your fibroid may require you to have a C-section. That’s because its growth can alter your baby’s position, or block off your delivery pathway.

Getting Pregnant with Fibroids

Sometimes, the location of your fibroid can make it difficult to become pregnant. In fact, we find fibroids in between 5% – 10% of women with infertility. The most common culprits? Fibroids that are inside your uterine cavity (submucosal). You may also have trouble getting pregnant with very large intramural fibroids (the ones within the wall of your uterus.)

Luckily, most women with fibroids can still become pregnant. But if you have fibroids and plan to get pregnant, you should receive a thorough medical evaluation. After all, fibroids can impact your fertility in several ways.

They can changes your cervix shape, limiting the number of sperm that enter your uterus. Depending on location, fibroids can also change your uterine shape, getting in the way of sperm or fertilized embryos. Some fibroids may block your fallopian tubes, which keeps your egg from traveling to your uterus for fertilization. Also, fibroids can impact your endometrial lining, making it harder for embryos to implant. This problem is further complicated if fibroid affect blood flow to your uterine cavity. Why? Limited blood makes it even tougher for embryos to implant in your uterus.

So, that’s what you need to watch out for when you’re trying to conceive. Or when you’re dealing with pregnancy  and fibroids. But here’s some good news for you. Most fibroids don’t grow during pregnancy. In fact, with your changing hormone levels, some fibroids may even shrink while you’re pregnant.  Still, given the potential risks to you and your growing baby, you should talk to your healthcare provider about your fibroids if you want to become or already are pregnant.

Sources: American Society for Reproductive Medicine

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