By Nina Lemtir | Nutrition Lifestyle Strategist & Founder, The Womb Care Network

What Your Doctor May Not Have Told You About Birth Control and Fibroids

If your doctor put you on birth control to 'manage' your fibroids — this is the conversation you were never meant to hear.

You were told it would help. The bleeding would slow down. The pain would ease. And perhaps, for a while, it did.

But if you are reading this, something is telling you that the pill, the coil, or the injection is not the whole answer — and you are right to question it.

Hormonal birth control is one of the most commonly prescribed options for fibroid symptoms. Yet very few women are told — clearly and honestly — what that actually means for their body, their fibroids, and their long-term womb health.

This post is not an argument against birth control. It is an argument for your right to make an informed choice. There is a significant difference between those two things.

Why Birth Control Gets Prescribed for Fibroids

Uterine fibroids affect an estimated 70 to 80 per cent of women by the age of 50. Black women are disproportionately affected — experiencing fibroids earlier, in greater numbers, and with more severe symptoms. (1)

Fibroids are estrogen-sensitive. They grow in response to hormonal shifts — particularly elevated estrogen — and are increasingly understood to be sensitive to progesterone as well. (2) The most common symptoms are heavy bleeding, pelvic pain, bloating, and pressure on the bladder or bowel.

Hormonal contraceptives — the combined pill, the progesterone-only pill, the hormonal IUD (Mirena coil), and hormonal injections — are frequently prescribed because they can reduce bleeding and regulate the cycle. (3) For a woman in daily pain or losing dangerously high volumes of blood each month, that reduction in symptoms can feel life-changing.

What your GP may not explain:

Hormonal birth control does not shrink fibroids.
It does not address the underlying hormonal environment that caused them to grow.
In some women, the hormonal load can contribute to further growth over time. (4)
Managing symptoms is not the same as addressing the condition.
For women who want to preserve their fertility or reduce their fibroid burden — hormonal suppression alone is rarely sufficient.

The Estrogen Dominance Connection

To understand why birth control can be a complicated choice for fibroid sufferers, you need to understand estrogen dominance — the state in which estrogen is elevated relative to progesterone in the body.

Estrogen dominance does not necessarily mean your estrogen is high in absolute terms. It means the balance is disrupted. Research consistently shows that fibroids express higher levels of estrogen receptors than normal uterine tissue, making them particularly sensitive to estrogenic stimulation. (5) Some combined hormonal contraceptives can worsen this imbalance.

Even progesterone-only options are not always straightforwardly beneficial. Synthetic progestins found in contraceptives are not the same as natural progesterone. Studies show that fibroid tissue contains significantly higher concentrations of progesterone receptors compared to the surrounding uterine muscle — meaning synthetic progestins can, in some cases, stimulate fibroid cell growth rather than restrict it. (6)

A 2013 study published in Fertility and Sterility found that progesterone promotes fibroid growth by stimulating fibroid stem cells — a mechanism that synthetic progestins may replicate. (7) This is not a reason to avoid all hormonal options. It is a reason to have a more detailed conversation with your care provider.

Signs Your Birth Control May Be Affecting Your Fibroids

Not every woman who takes hormonal contraception will experience fibroid progression. Bodies are individual. But there are patterns worth paying attention to. If you are currently on hormonal birth control and notice any of the following, it is worth seeking a fuller assessment:

Increased bloating or pelvic pressure since starting contraception
Breakthrough bleeding or spotting that feels heavier than expected
Worsening fatigue, particularly in the week before your withdrawal bleed
Heightened mood symptoms — low mood, anxiety, or irritability
Weight gain concentrated around the abdomen and hips
Persistent low libido or vaginal dryness
New or worsening digestive symptoms — constipation, bloating, or irregularity
A feeling that something has shifted, even if tests come back 'normal'

These symptoms alone do not prove that your contraceptive is making your fibroids worse. But they are signals worth listening to. A 2020 review noted that women with fibroids frequently experience a complex mix of hormonal, inflammatory, and metabolic symptoms that are often underattributed to their underlying condition. (8) They deserve investigation — not dismissal.

A Closer Look at the Mirena Coil

The Mirena IUD is frequently recommended to women with fibroids as a first-line option. It releases a low, localised dose of levonorgestrel — a synthetic progestin — directly into the uterine cavity, primarily to reduce menstrual bleeding.

For many women, it is effective. A Cochrane Review found that the levonorgestrel IUD significantly reduces menstrual blood loss in women with fibroids, with some studies reporting reductions of up to 90 per cent in bleeding volume. (9) Some women experience no periods at all.

What to know before you decide:

Effectiveness depends on fibroid location. Submucosal fibroids — those that protrude into the uterine cavity — can prevent the coil from sitting correctly, reducing its effectiveness. Fibroid distortion of the uterine cavity is associated with higher rates of IUD expulsion. (10)
Localised does not mean zero systemic effect. Some women do experience hormonal side effects from the Mirena, including changes to mood, skin, libido, and metabolism. Measurable serum levels of levonorgestrel are detectable in users. (11)
It treats the symptom, not the source. Fibroids may continue to grow whilst bleeding is being managed. (4)
Insertion can be more complex with fibroids. Depending on fibroid size and position, insertion may require specialist support — worth discussing explicitly before the procedure.

What a Root-Cause Approach Looks Like

Managing fibroid symptoms with hormonal contraception is a legitimate short-term tool. For some women, it is the right bridge whilst pursuing longer-term solutions. But it should not be the end of the conversation.

A root-cause approach asks different questions: Why is the hormonal environment favourable to fibroid growth? What is happening in the gut, the liver, and the lymphatic system that is influencing estrogen metabolism? How is inflammation — driven by diet, stress, and environment — contributing to the picture?

These questions have answers. Emerging research highlights the role of the gut microbiome — specifically the estrobolome, the collection of gut bacteria responsible for metabolising estrogen — in regulating circulating estrogen levels. (12) Disruption through poor diet, antibiotic use, or gut imbalance may contribute to the estrogen excess that drives fibroid growth.

Nutritional deficiencies are also well-documented in fibroid sufferers. Studies have found associations between low vitamin D levels and increased fibroid risk and severity, with vitamin D demonstrating anti-proliferative effects on fibroid cells. (13) Iron deficiency, magnesium depletion, and B vitamin insufficiency are also commonly observed in women experiencing heavy menstrual bleeding. (14)

A root-cause plan typically addresses:

Liver detoxification pathways and estrogen clearance
Gut microbiome health and estrobolome function
Nutritional deficiencies — iron, vitamin D, magnesium, B vitamins
Stress and cortisol's impact on progesterone production
Dietary estrogen load from food and personal care products
Inflammation through targeted anti-inflammatory nutrition

Questions to Ask Your Doctor

You are entitled to a full conversation with your healthcare provider. Here are the questions that will help you leave any appointment better informed:

Will this contraceptive affect the size or growth rate of my fibroids over time?
Has my fibroid type and location been factored into this recommendation?
What monitoring should be in place — and how often will my fibroids be assessed?
What are the options if my symptoms worsen or do not improve?
At what point would surgical or other interventional options become appropriate?
What can I do nutritionally and through lifestyle to support my womb health alongside this?

If your doctor cannot or will not engage with these questions, that is important information. You deserve a provider who treats you as a partner in your own care.

You Deserve More Than Symptom Management

Birth control is not the enemy. But it is not the whole story either.

Inside The Womb Care Network, Nina works with women to address the root causes of fibroid growth — through personalised nutrition, targeted supplementation, gut and hormone support, and a community of women who truly understand what you are going through.

If this post has opened questions for you, that is a good sign. Bring those questions somewhere they will be heard — and answered.

Your womb is not a problem to be managed. It is a part of you worth caring for properly.

Ready to Take the Next Step?

Book a personal Fibroid Freedom Formula Session with Nina:

→ calendly.com/ninalemtir/your-fibroid-freedom-formula-session

Or join a global community of women empowering their wombs:

→ skool.com/the-womb-wellness-network-7782

References

1. Baird DD et al. (2003). High cumulative incidence of uterine leiomyoma in black and white women. Am J Obstet Gynecol, 188(1), 100–107.

2. Bulun SE. (2013). Uterine fibroids. N Engl J Med, 369(14), 1344–1355.

3. Lethaby A et al. (2008). Cyclical progestogens for heavy menstrual bleeding. Cochrane Database Syst Rev.

4. Duhan N. (2011). Current and emerging treatments for uterine myoma. Int J Women's Health, 3, 231–241.

5. Moravek MB & Bulun SE. (2015). Endocrinology of uterine fibroids. Curr Opin Obstet Gynecol, 27(4), 276–283.

6. Ishikawa H et al. (2010). Progesterone is essential for maintenance and growth of uterine leiomyoma. Endocrinology, 151(6), 2433–2442.

7. Yin P et al. (2013). Human uterine leiomyoma stem/progenitor cells. J Clin Endocrinol Metab, 100(4), E601–606.

8. Stewart EA et al. (2020). Epidemiology of uterine fibroids: a systematic review. BJOG, 124(10), 1501–1512.

9. Zapata LB et al. (2010). Intrauterine device use among women with uterine fibroids. Contraception, 82(1), 41–55.

10. Jukic AM et al. (2013). Length of human pregnancy and contributors to its natural variation. Hum Reprod, 28(10), 2848–2855.

11. Sivin I & Stern J. (1994). Health during prolonged use of levonorgestrel 20 mcg/d IUD. Fertil Steril, 61(1), 70–77.

12. Baker JM et al. (2017). Estrogen–gut microbiome axis. Maturitas, 103, 45–53.

13. Sabry M et al. (2012). Serum vitamin D3 level inversely correlates with uterine fibroid volume. Int J Women's Health, 4, 93–100.

14. Ciebiera M et al. (2018). Influence of vitamin D and TGF-β3 on uterine fibroids. Fertil Steril, 109(4), 734–742.

This content is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional regarding your individual health needs.