Fibroids are one of the most common gynaecological conditions in women of reproductive age — and one of the most anxiety-provoking when pregnancy is the goal. The relationship between fibroids and fertility is real but highly dependent on fibroid type and location. This article explains what actually matters and what the evidence supports.
The Direct Answer
Most women with fibroids — including many with multiple or large fibroids — conceive and carry pregnancies successfully without any intervention. Fibroids do not automatically cause infertility. However, depending on their location, they can reduce conception rates and increase miscarriage risk.
Which Fibroids Affect Fertility Most?
This is the most important distinction. Submucosal fibroids — those that grow into or distort the uterine cavity — have the clearest negative impact on fertility. They interfere with implantation by disrupting the uterine lining and may increase miscarriage risk. Studies consistently show that removing submucosal fibroids improves fertility outcomes.
Intramural fibroids (in the uterine wall) may affect fertility when large or when they distort the cavity. Studies are less consistent here — some show reduced fertility, others do not. Size and cavity distortion are the key variables.
Subserosal fibroids (on the outer surface) generally do not affect fertility unless very large.
How Fibroids Interfere with Conception
Fibroids affect fertility through several mechanisms: distorting the uterine cavity makes implantation more difficult; blocking the fallopian tubes (rare but possible) prevents fertilisation; impairing uterine blood flow affects the endometrial environment; and inflammatory changes in the uterine lining may reduce receptivity.
When Should Fibroids Be Treated Before Trying To Conceive?
Treatment before trying to conceive is most strongly recommended when submucosal fibroids are present, when fibroids are large and distort the cavity, when there is a history of miscarriage, or when other fertility challenges exist alongside the fibroids.
For women with intramural or subserosal fibroids that do not distort the cavity, many specialists recommend attempting conception first rather than intervening preemptively — particularly given that myomectomy carries its own risks including uterine scarring.
Lifestyle Factors That Support Fertility With Fibroids
Supporting overall hormonal health improves the fertility environment alongside any fibroid-specific treatment. An anti-inflammatory diet, regular exercise, stress management, and maintaining a healthy body weight all reduce the estrogenic burden that drives both fibroid growth and hormonal disruption relevant to fertility.
For detailed information on fibroids during pregnancy once you do conceive, see our article on fibroids and pregnancy risks.
