Fibroids are extremely common. In fact, most women will develop them at some point in their lives, often without ever knowing. Many cause no symptoms and are discovered incidentally during routine scans or fertility assessments.
But when you are trying to conceive, the question becomes more specific and more personal. If fibroids are present, could they be affecting your chances of getting pregnant, either naturally or through IVF?
Quick answer: Can fibroids cause infertility? In some cases, yes. Fibroids that distort the uterine cavity or interfere with implantation can reduce fertility and IVF success rates. However, many fibroids have little or no impact. The effect depends primarily on location and how they interact with the uterine lining.
Fibroids, also known as leiomyomas, are benign growths that develop within the muscular wall of the uterus. They can vary widely in size, number and location, which is why their impact on fertility is not uniform.
Some fibroids remain small and clinically insignificant. Others grow large enough to alter the shape of the uterus or affect its internal environment. It is this interaction with the uterine cavity that determines whether fibroids are relevant to fertility.
If you are unfamiliar with the condition, understanding what uterine fibroids are and how they develop provides useful context for why some fibroids matter and others do not.
One of the most common misconceptions is that larger fibroids are always more problematic. In reality, location is often more important than size.
Fibroids that grow into the uterine cavity, known as submucosal fibroids, have the clearest and most consistent negative impact on fertility. Even relatively small ones can disrupt implantation because they alter the shape and function of the endometrial lining.
Intramural fibroids, which sit within the uterine wall, occupy a more complex middle ground. Small intramural fibroids that do not distort the cavity may have little effect. However, as they grow or begin to push into the uterine space, their impact becomes more significant.
In contrast, subserosal fibroids grow on the outside of the uterus and rarely interfere with reproductive processes. These are usually considered clinically irrelevant from a fertility perspective.
For many women, fibroids do not prevent pregnancy. But when they do affect fertility, the mechanisms are usually related to implantation and the uterine environment rather than egg quality.
One of the most important factors is the ability of an embryo to implant into the uterine lining. Fibroids that distort the cavity can physically interfere with this process. They may also alter blood flow to the endometrium, reducing its receptivity at the critical moment when implantation occurs.
In addition to structural effects, fibroids may influence the local uterine environment. Changes in inflammation, hormonal signalling and uterine contractility have all been observed in some cases. These changes are subtle but can affect how the uterus supports early embryo development.
Larger fibroids may also have mechanical effects, such as compressing the fallopian tubes or interfering with sperm transport. While less common, these factors can contribute to reduced fertility in certain situations.
For a more detailed clinical perspective, you can explore how uterine fibroids can affect fertility outcomes, which explains these mechanisms in greater depth.
The relationship between fibroids and fertility is well studied, but it is not uniform across all types.
There is strong evidence that submucosal fibroids reduce fertility and increase miscarriage risk. Importantly, removing these fibroids has been shown to improve pregnancy rates, both in natural conception and IVF.
Intramural fibroids present a more nuanced picture. Smaller fibroids that do not affect the uterine cavity often have minimal impact. However, larger fibroids, particularly those over 4 cm or those that distort the cavity, may reduce fertility.
Subserosal fibroids, on the other hand, are generally not associated with reduced fertility and typically do not require treatment before attempting conception.
These distinctions are reflected in international guidelines, which emphasise individual assessment rather than routine intervention.
When moving into IVF treatment, the role of fibroids becomes more clinically important.
IVF bypasses many steps of natural conception, including ovulation and fertilisation. However, implantation remains a critical step, and this is where fibroids can have a measurable effect.
It is important to be clear that fibroids do not affect egg quality. Instead, they influence the uterine environment in which the embryo must implant and develop.
Studies show that fibroids affecting the uterine cavity are associated with lower implantation rates, reduced clinical pregnancy rates and lower live birth rates. This effect is most pronounced with submucosal fibroids.
Intramural fibroids may also affect IVF outcomes, but the impact depends on their size and proximity to the cavity. Smaller, non-distorting fibroids often do not significantly change success rates.
This is one of the most common and most complex questions.
In general, removal is recommended when fibroids clearly interfere with the uterine cavity. Submucosal fibroids are the clearest example, as their removal improves outcomes.
For intramural fibroids, the decision is more individualised. Factors such as size, number, previous IVF attempts and overall prognosis are all considered. Larger fibroids or those associated with repeated implantation failure may warrant removal.
However, surgery is not without trade-offs. Myomectomy involves recovery time and may delay fertility treatment. In some cases, the benefits of removal must be carefully weighed against these factors.
This is why decisions around fibroid treatment should always be personalised rather than protocol-driven.
Even after successful conception, fibroids can influence pregnancy.
Women with fibroids may have a slightly higher risk of miscarriage, preterm birth and certain placental complications. However, it is important to emphasise that many women with fibroids have completely normal pregnancies and healthy babies.
Fibroids may grow during pregnancy, particularly in the first trimester, due to hormonal changes. In some cases, this growth can cause pain, but it does not necessarily lead to complications.
Fibroids often introduce uncertainty into the fertility journey.
It is common to wonder whether they are the reason conception has not happened, or whether treatment is necessary before proceeding with IVF. Because the evidence is nuanced, answers are not always immediate or straightforward.
This uncertainty can be difficult, but it also reflects the reality that fertility care is highly individual. The goal is not to apply a one-size-fits-all solution, but to understand how fibroids interact with your specific situation.
If fibroids are part of your fertility assessment, the most important step is to understand their characteristics.
Ask your clinician:
In addition to medical planning, some women explore supportive strategies such as nutrition for managing uterine fibroids or supplements for managing uterine fibroids. These approaches may support overall health but should not replace clinical evaluation when fertility is affected.
Fibroids often raise practical and emotional questions, especially when you are trying to conceive or planning IVF. Below are clear, evidence-based answers to the most common concerns.
No. Many fibroids, especially those located on the outside of the uterus (subserosal), have little to no impact on fertility. Only certain types, particularly submucosal and some intramural fibroids, are associated with reduced fertility.
Submucosal fibroids have the strongest link to fertility issues because they grow into the uterine cavity and interfere with implantation. Larger intramural fibroids may also affect fertility if they distort the cavity.
Yes. Many women with fibroids conceive naturally without difficulty. Fibroids only affect fertility in specific situations, and their presence does not automatically mean you will struggle to conceive.
Fibroids can affect IVF success if they impact the uterine cavity. They do not affect egg quality but may reduce implantation rates and pregnancy outcomes depending on their size and location.
Removal is usually recommended if fibroids distort the uterine cavity or are associated with repeated IVF failure. In other cases, especially with small or non-distorting fibroids, surgery may not be necessary.
Fibroids, particularly those affecting the uterine cavity, are associated with a higher risk of miscarriage. However, many women with fibroids still have successful pregnancies.
Fibroids are typically evaluated using ultrasound, saline infusion sonography or MRI. The key question is whether they distort the uterine cavity or affect the lining where implantation occurs.
Yes, fibroids may grow during pregnancy, especially in the early stages due to hormonal changes. Growth varies between individuals and does not always lead to complications.
Lifestyle factors such as balanced nutrition and overall health may support reproductive function, but they do not remove fibroids or replace medical treatment when needed. They are best used alongside clinical care.
Fibroids are common, and in many cases, they do not affect fertility at all.
When they do have an impact, it is usually because they alter the uterine cavity or interfere with implantation. Location matters more than size, and not all fibroids require treatment.
Understanding whether fibroids are relevant in your case allows you to move forward with clarity rather than uncertainty.
Having fibroids does not mean you cannot conceive.
Many women with fibroids achieve pregnancy naturally or with treatment. When intervention is needed, targeted approaches can improve outcomes.
Fertility care today is not about removing every variable. It is about identifying the ones that matter for you and building a plan around them.
References:
4.7 rating on App Stores
