"No Babies = Fibroids?" Why This Common Health Myth is Flat-Out Wrong

 Disclaimer: I am a blogger, not a doctor! The information in this post is for educational and entertainment purposes only and should not be taken as professional medical advice. Always consult with a healthcare professional for any medical concerns.

Last week, I was having a chat with my cousin. He was telling me about one of my aunts who was neither married nor had any kids. He claimed she developed fibroids because she had never gotten pregnant before. But the truth is, fibroids occur in both mothers and non-mothers alike.

Before we dive deeper into this article, I must clear up a common mix-up between two completely different medical terms: fibrosis (general organ scarring) and uterine fibroids (benign growths in the womb).

Fibrosis: This is general tissue scarring caused by injury or chronic inflammation (like liver cirrhosis or lung scarring). Not giving birth has absolutely nothing to do with this.

Uterine Fibroids (Leiomyomas): These are non-cancerous, rubbery tumors made of smooth muscle and fibrous tissue that grow in or on the wall of the uterus.

So, why do people believe that a woman not giving birth will result in fibroids?

The "Estrogen Window"

In general women’s health, the "estrogen window" refers to the total amount of time a woman’s body is exposed to active, cycling estrogen throughout her lifetime. Think of this window like a clock that starts ticking at a girl’s very first period (menarche) and stops ticking when she goes through menopause.

The longer this window is open, and the more uninterrupted it is, the more estrogen the body is exposed to. A few key milestones change the size or intensity of this window:

• What widens or intensifies the window: Starting your period at a very young age, going through menopause at a later age, or never getting pregnant.
• What pauses or shrinks the window: Pregnancy and breastfeeding. During these times, ovulation stops, and the uterus gets a long, natural break from monthly spikes of estrogen.

Fibroids are heavily fueled by the female hormones estrogen and progesterone. They only grow during a woman's reproductive years and typically shrink after menopause when hormone levels drop. If a woman has never been pregnant, her "estrogen window" runs continuously without a break, giving fibroids more consistent "fuel" to grow. This is why it is a statistical risk factor, but it is still not a guarantee that she will get fibroids.

The Real Risk Factors for Fibroids

Millions of women who have never given birth live their entire lives without ever getting a single fibroid. Conversely, many mothers develop severe fibroids. Other factors play a much larger role than pregnancy history:

Genetics & Family History: If a woman's mother or sister had fibroids, her risk is significantly higher.

Age: They are most common in women in their 30s and 40s. A lady might not have fibroids in her 20s, but upon reaching her 30s, she may develop them.

Race: Fibroids are exceptionally common in Black women, who are statistically more likely to develop them at an earlier age and experience larger growths, regardless of whether they have had children.

Not giving birth does not "cause" your body to scar or create growths; it simply means your hormonal patterns look different than those of someone who has been pregnant.

Can Fibroids Stop a Woman From Giving Birth?

Another cousin of mine got pregnant with her first child and successfully gave birth. However, when she was ready for her second child, her doctor diagnosed her with fibroids. We were completely surprised by the news. Since she had already conceived once without any issues, we wondered: why couldn't she conceive now? Did the fibroids just appear out of the blue to hinder her, or was the doctor lying to us?

The truth is, the vast majority of women with fibroids have completely normal, healthy pregnancies and give birth without any issues at all. In fact, most women who have them don't even know they are there.

However, in about 5% to 10% of female infertility cases, fibroids are found to be a contributing factor. Whether a fibroid impacts a woman's ability to give birth depends almost entirely on where it is growing and how big it is.

Uterine Fibroid Locations and Their Impact

Fibroids are categorized by where they sit in the uterine wall:

Submucosal Fibroids (The Main Problem for Fertility): These grow right under the inner lining of the uterus and bulge directly into the open cavity where a baby would grow. Even if they are very small, submucosal fibroids act like a literal roadblock. They can block the fallopian tubes (preventing the egg and sperm from meeting) or distort the lining of the womb so a fertilized egg cannot properly attach (implant).

Intramural Fibroids (The Middle Ground): These grow within the thick muscular wall of the uterus. If they stay small, they usually cause zero fertility issues. However, if they grow very large (think the size of a grapefruit), they can warp the shape of the entire uterus or crowd out the blood supply, making miscarriage more likely.

Subserosal & Pedunculated Fibroids (Usually Safe): These grow on the outside of the uterus, pointing out into the pelvis. Because they do not interfere with the inside of the womb, they almost never affect a woman's ability to get pregnant or give birth.

How Fibroids Affect Pregnancy and Delivery

If a woman does get pregnant while having large fibroids, they can occasionally complicate the pregnancy or the delivery itself:

Risk of Miscarriage or Preterm Birth: Because fibroids feed on estrogen, pregnancy hormones can cause them to grow rapidly. If they grow too big, they can steal blood flow from the developing placenta or leave less room for the baby, leading to early labor.

Breech Baby: If a fibroid takes up too much space at the bottom of the uterus, the baby might not be able to flip head-down, forcing a feet-first (breech) position.

Increased Need for a C-Section: If a large fibroid physically blocks the cervix (the exit of the womb), a natural vaginal birth becomes impossible, and a Cesarean section is required.

Fortunately, if a woman is struggling to conceive due to fibroids, the condition is highly treatable. Surgeons can perform a procedure called a myomectomy, where they carefully remove just the fibroids while leaving the uterus completely intact. Once the uterus heals, many women go on to conceive and give birth naturally.

Q/A

Do you know anyone that had fibroids and hasn't had kids? Or do you have fibroids and your concerned of it you'll ever have kids? Share your story in the comments.