If you have been told you have an intramural fibroid, the first thing to know is that fibroids are almost always non-cancerous, and many women live with them without ever experiencing symptoms. Having a fibroid does not automatically mean you need treatment or that your fertility is at risk.
An intramural fibroid is a growth that develops within the muscular wall of the uterus. Among all types of uterine fibroids, intramural fibroids are the most common, and they can range in size from a few millimetres to several centimetres. Some women may notice heavy periods, pelvic discomfort, or have questions about how fibroids relate to fertility. Because fibroids are so common, especially in the 30–45 age group, understanding them can help with realistic planning and informed conversations with your gynaecologist.
Key takeaways
- An intramural fibroid grows inside the muscular wall (myometrium) of the uterus and is almost always benign.
- Intramural fibroids are the most common fibroid type, accounting for roughly 70% of all cases.
- Many women have no symptoms. When present, symptoms may include heavy periods, pelvic pressure, and frequent urination.
- An intramural fibroid is not typically dangerous, but larger fibroids may affect quality of life or fertility depending on size and location.
- Intramural fibroid treatment ranges from observation and medication to surgical options like myomectomy, depending on individual needs.
- A personalised evaluation is the most reliable way to understand how fibroids may affect your health or reproductive plans.
What is an intramural fibroid?
An intramural uterine fibroid is a non-cancerous growth that develops in the myometrium, which is the thick muscular layer of the uterus. The word “intramural” comes from Latin: intra (inside) and mural (wall). So an intramural fibroid is a growth inside the wall of the uterus.
How common are intramural fibroids?
Intramural fibroids are the most common type of uterine fibroid, accounting for roughly 70% of all fibroid cases. According to the NIH (National Institutes of Health), uterine fibroids are the most common benign tumours in women of reproductive age, with up to 70–80% of women developing fibroids by age 50. Many may have them without ever knowing. Indian studies have reported a prevalence of around 20–24% among women of reproductive age, with a higher incidence in the 30–39 age group.
Types based on location
Even within the intramural category, fibroids can sit in slightly different positions within the uterine wall.
- Fundal intramural fibroids grow near the top of the uterus. Depending on their size, they may press against the fallopian tubes.
- Anterior intramural fibroids develop on the front wall of the uterus and may cause bladder-related symptoms like frequent urination.
- Posterior intramural fibroids grow on the back wall and can sometimes lead to lower back discomfort or pressure during bowel movements.
What causes intramural fibroids?
The exact cause of intramural fibroids is not fully understood. However, several factors are believed to play a role.
Hormonal factors
Oestrogen and progesterone, the two main female reproductive hormones, appear to promote fibroid growth. Fibroids tend to grow during the reproductive years when hormone levels are higher and may shrink after menopause when these levels decline. According to the NICHD (a division of the National Institutes of Health), hormonal interaction is one of the key areas of fibroid research.
Genetics and family history
A family history of fibroids can increase the likelihood of developing them. If a close family member has had fibroids, you may be more likely to develop them as well. Research published in Science (Mäkinen et al., 2011) identified mutations in the MED12 gene at high frequency in uterine fibroids, and the NICHD lists genetic factors as a key area of ongoing fibroid research.
Other contributing factors
Certain lifestyle and health factors may also be associated with fibroid risk:
- Higher body weight or obesity
- Early onset of menstruation (before age 12)
- A diet low in fruits and vegetables
- Never having been pregnant (nulliparity)
- Vitamin D deficiency
Symptoms of an intramural fibroid
Not all intramural fibroids cause symptoms. In fact, many are discovered incidentally during a routine pelvic exam or ultrasound. Symptoms tend to appear when fibroids grow larger or when multiple fibroids are present.
Common signs to watch for
Symptoms that may point to intramural fibroids include:
- Heavy menstrual bleeding or periods lasting longer than seven days
- Pelvic pain or a feeling of heaviness in the lower abdomen
- Frequent urination, especially if the fibroid presses on the bladder
- Constipation or discomfort during bowel movements
- Pain during intercourse
- A visibly enlarged abdomen in cases of large fibroids
When symptoms overlap with other conditions
Some of these symptoms can also be associated with conditions like adenomyosis, endometriosis, or hormonal imbalances. A proper evaluation by a gynaecologist, often supported by imaging, is the most reliable way to identify the cause.
Is an intramural fibroid dangerous?
In the vast majority of cases, an intramural fibroid is not dangerous. Intramural fibroids are benign (non-cancerous), and according to the NICHD, fibroids do not typically turn into cancer. However, depending on their size and position, they can cause symptoms that affect daily life or reproductive health.
When do fibroids need attention?
While fibroids are not life-threatening, they can cause significant discomfort and may affect quality of life if left unmanaged. Heavy menstrual bleeding, for example, can lead to iron-deficiency anaemia over time. Large fibroids may cause pressure symptoms that interfere with daily activities.
Fibroids and fertility
The relationship between intramural fibroids and fertility is more nuanced. Small fibroids that do not distort the uterine cavity may not significantly affect the ability to conceive. However, larger intramural fibroids, particularly those greater than 3–5 cm or those that press inward toward the uterine cavity, may influence implantation and pregnancy outcomes. A meta-analysis of 28 studies involving over 9,000 IVF cycles found that non-cavity-distorting intramural fibroids were associated with a modest but significant reduction in live birth rates (RR 0.82) compared to women without fibroids.
For women planning pregnancy or undergoing fertility assessment, discussing fibroids with a specialist can help clarify their impact on individual fertility. Since conception involves multiple factors beyond the uterus, a male fertility assessment alongside the evaluation may provide a more complete picture.
How are intramural fibroids diagnosed?
Diagnosis usually begins with a clinical evaluation and is confirmed through imaging.
Common diagnostic methods
- Pelvic examination: A gynaecologist may feel an enlarged or irregularly shaped uterus during a routine exam.
- Ultrasound: Transvaginal or abdominal ultrasound is the most common first-line imaging tool. Sound waves create a picture of the uterus, showing the size, number, and location of fibroids.
- MRI (Magnetic Resonance Imaging): An MRI provides more detailed images and is particularly useful when planning treatment or when multiple fibroids are present.
- Hysteroscopy: A thin camera is inserted through the cervix to view the inside of the uterus. Helpful when there is concern about fibroids affecting the uterine cavity.
Intramural fibroid treatment options
The right approach to intramural fibroid treatment depends on the size and location of the fibroid, the severity of symptoms, and whether you are planning a pregnancy.
Observation (watch and wait)
Small, symptom-free fibroids may not need any treatment at all. Your doctor may recommend periodic check-ups and ultrasounds to monitor them. Many fibroids remain stable or even shrink after menopause.
Medication
Medications can help manage symptoms, but do not eliminate fibroids permanently. Options may include:
- Hormonal medications such as oral contraceptive pills or a hormonal IUD (intrauterine device) to reduce heavy bleeding
- GnRH agonists (gonadotropin-releasing hormone agonists) temporarily lower oestrogen levels and can shrink fibroids before surgery. Since these are injectable medications, understanding how to manage IVF shots can be helpful if injections are part of your treatment plan.
- Pain relief through anti-inflammatory medications for managing discomfort during periods
Surgical options
When fibroids are large, causing significant symptoms, or affecting fertility, surgery may be considered.
- Myomectomy removes the fibroid while preserving the uterus. Suitable for women who wish to retain their fertility. Can be performed via laparoscopy, hysteroscopy, or open surgery, depending on the fibroid size and location.
- Uterine Artery Embolisation (UAE) is a minimally invasive procedure that blocks the blood supply to the fibroid, causing it to shrink. Not typically recommended for women planning future pregnancies.
- Hysterectomy involves the removal of the uterus entirely. Considered in severe cases or when other treatments have not provided relief. A permanent solution, meaning pregnancy is no longer possible afterwards.
The choice between these options is deeply personal and should be guided by your gynaecologist based on your individual health profile and reproductive goals. For women considering IVF after fibroid removal, understanding the timing and feasibility of IVF cycles may also be relevant to planning.
Can intramural fibroids affect pregnancy?
Many women with intramural fibroids have healthy pregnancies without complications. However, depending on the size and position of the fibroid, there may be a slightly higher risk of certain outcomes such as preterm delivery or the need for a caesarean section. A 2021 prospective cohort study involving over 4,600 women found no significant difference in preterm birth rates between women with and without fibroids, which offers some reassurance.
For women undergoing IVF or considering egg freezing, a thorough fertility evaluation can help determine whether a fibroid needs to be addressed before treatment.
Lifestyle and self-care
While lifestyle changes alone cannot remove fibroids, certain habits may support overall reproductive health:
- A balanced diet rich in fruits, vegetables, and whole grains
- Regular physical activity
- Maintaining a healthy weight
- Adequate sleep and stress management
Understanding your options with the right support
An intramural fibroid diagnosis can feel overwhelming, but knowing what you are dealing with is the first step toward clarity. Most intramural fibroids are benign, treatable, and manageable with the right guidance.
At Luma fertility, we believe that every fertility journey deserves a personalized approach. Our team, led by experienced specialists, evaluates fibroids in the context of your complete reproductive health, not in isolation. Whether you need a detailed fertility assessment, a second opinion on your treatment plan, or support navigating your next steps, we are here to help you move forward with confidence and care.
Disclaimer: This content is for awareness only, not a substitute for medical advice.
FAQs
Q: Are intramural fibroids cancerous?
No. Intramural fibroids are almost always benign (non-cancerous). According to the NICHD, uterine fibroids do not typically transform into cancer. Regular monitoring through ultrasound or pelvic exams is usually sufficient.
Q: Can an intramural fibroid affect my ability to get pregnant?
Small intramural fibroids that do not distort the uterine cavity may have little impact on fertility. However, larger fibroids or those pressing on the uterine cavity can sometimes affect implantation. A detailed evaluation with your gynaecologist or fertility specialist can help clarify your individual situation.
Q: Do intramural fibroids always need surgery?
No. Many intramural fibroids are small and cause no symptoms. In such cases, doctors may recommend monitoring with periodic check-ups and imaging rather than immediate treatment. Surgery is typically considered when symptoms are significant or when fibroids may be affecting fertility.
Q: Can intramural fibroids come back after removal?
Yes. Myomectomy removes existing fibroids but does not prevent new ones from forming. Recurrence rates vary, and ongoing monitoring is usually recommended after surgery. For women pursuing IVF, understanding how many times you can undergo IVF can help with longer-term planning if fibroids recur.
Q: Do fibroids shrink after menopause?
Fibroids are influenced by oestrogen and progesterone. After menopause, when these hormone levels drop, fibroids may shrink in size, and symptoms often reduce. However, the degree of shrinkage varies from person to person.
Q: When should someone see a doctor about fibroids?
Consult a gynaecologist if you experience heavy or prolonged periods, persistent pelvic pain, frequent urination without an obvious cause, or if you have been trying to conceive for six months or longer without success. Early evaluation can help identify whether fibroids may be a contributing factor.
Sources:
- NICHD, National Institutes of Health – Uterine Fibroids: https://www.nichd.nih.gov/health/topics/uterine
- NICHD – Risk Factors for Uterine Fibroids: https://www.nichd.nih.gov/health/topics/uterine/conditioninfo/people-affected
- StatPearls, NCBI – Uterine Leiomyomata: https://www.ncbi.nlm.nih.gov/books/NBK546680/
- PMC – The Impact and Management of Fibroids for Fertility: https://pmc.ncbi.nlm.nih.gov/articles/PMC3608270/
- PMC – The Impact of Noncavity-Distorting Intramural Fibroids on IVF-ET: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6142781/
- Predictors and Symptomatic Burden of Uterine Fibroids in South-Eastern India: https://www.ijrcog.org/index.php/ijrcog/article/view/5914
- Mäkinen et al. (2011), MED12 mutations in uterine leiomyomas, Science: https://pubmed.ncbi.nlm.nih.gov/21868628/
Cleveland Clinic – Uterine Fibroids: https://my.clevelandclinic.org/health/diseases/9130-uterine-fibroids
