Fibroids are extremely common, affecting up to 70% of women by the time they reach menopause. The good news is that these growths are almost always benign, meaning they are not cancerous.
However, their size can play a significant role in determining what symptoms you might experience and which treatment approach may be most suitable for you. Understanding when fibroid size becomes a concern can help you make informed decisions about your health and know when it might be time to seek specialist advice.
This article is designed to help patients understand the relationship between fibroid size and potential complications, so you can feel more confident navigating your own fibroid journey.
Does Size Really Matter When It Comes to Fibroids?
Size certainly matters when assessing fibroids, but it is not the only factor to consider. Some large fibroids cause very few symptoms, while some small fibroids may cause significant discomfort depending on their location. A small fibroid positioned inside the uterine cavity, for example, can cause heavier bleeding than a much larger one located on the outer wall. Growth rate is also monitored closely, as rapid enlargement can sometimes indicate the need for further investigation or intervention.
In other words, a small fibroid in a sensitive area can cause more difficulties than a larger fibroid in a less impactful location. This is why your doctor will always assess fibroids in context rather than focusing solely on measurements.
Fibroid Size and Weight – Chart and Visual Reference
The chart below helps illustrate how each fibroid size category compares to everyday, familiar objects, making it easier to visualise their actual size. Using a fibroid size and weight chart can provide clarity and help patients understand what their diagnosis really means in practical terms.
Small Fibroids
Small fibroids are typically less than 20 millimetres in diameter and are often discovered incidentally during routine ultrasound scans or pelvic examinations. Many women with small fibroids experience no symptoms at all, which is why they may go unnoticed for years.
Average or Medium Fibroids
Medium-sized fibroids, measuring between 20 and 60 millimetres, are more likely to produce noticeable symptoms. Women with fibroids in this range often report heavier or prolonged menstrual bleeding, pelvic pressure, or a persistent sense of fullness in the lower abdomen.
Large Fibroids
When discussing what size fibroid is considered large, fibroids over 60 millimetres are classified as large. These fibroids can distort the shape and size of the uterus and may even cause visible abdominal swelling. Large fibroids often lead to pressure symptoms that affect surrounding organs, such as the bladder or bowel, resulting in frequent urination or constipation.
When to Be Concerned About Fibroid Size
Concern about fibroid size typically arises when the fibroid begins to affect normal bodily function or causes persistent, troublesome symptoms. Rapid growth is another red flag, as it may warrant further investigation. Ultimately, the impact on your quality of life is one of the most important markers. If fibroids are preventing you from living comfortably, affecting your fertility, or causing you significant distress, it is time to seek specialist advice, regardless of the exact size measurement.
Signs That Suggest a Fibroid May Have Become “Dangerous”
Certain warning signs suggest that a fibroid may have reached a point where intervention is necessary:
- Rapid growth over a short period should always be investigated. Severe bleeding that leads to anaemia, causing fatigue and dizziness, is another serious concern.
- Difficulty conceiving or recurrent miscarriage may indicate that a fibroid is interfering with pregnancy.
- Persistent or worsening pelvic pain that does not respond to standard pain relief requires medical attention.
- Finally, bladder or bowel dysfunction, such as urinary frequency, incontinence or chronic constipation, can signal that a fibroid is compressing nearby organs and needs to be addressed.
Which Size of Fibroid Is Dangerous During Pregnancy?
Which size of fibroid is dangerous during pregnancy is a common concern for expectant mothers. Fibroids that affect the uterine cavity or significantly alter the shape and size of the uterus can pose risks during pregnancy. Potential complications include increased discomfort, restricted foetal growth, breech positioning of the baby, and an elevated risk of preterm birth.
However, many women with fibroids go on to have healthy pregnancies. Regular obstetric monitoring is essential to ensure both mother and baby remain safe throughout the pregnancy journey.
Treatment Options Based on Fibroid Size
Fibroid treatment recommendations vary depending on fibroid size, symptoms, personal preferences, and fertility plans. The table below outlines common considerations for each category.
Small fibroids typically require monitoring rather than immediate treatment. Hormonal methods may help regulate bleeding or cycle irregularity if needed. Intervention is usually only recommended if symptoms develop or if the fibroid begins to grow.
Medium-sized fibroids are often suitable for minimally invasive treatment, such as Uterine Fibroid Embolisation or Laparoscopic Myomectomy. These approaches can reduce fibroid size and symptoms or completely remove the fibroids while preserving the uterus. Open Myomectomy may be considered if dealing with a large number of fibroids
Large fibroids may require myomectomy to remove the fibroid while preserving the uterus, particularly for those planning a future pregnancy. In some cases, hysterectomy may be recommended when symptoms are severe or when fertility is not a concern. Treatment decisions are personalised to each patient’s needs and long-term goals.
Why choose London Women’s Centre?
At London Women’s Centre, we specialise in women’s health with a particular focus on compassionate, patient-centred care. Our experienced team is dedicated to supporting both your physical and emotional well-being throughout your treatment journey.
Mr Athanasias has extensive experience treating fibroids and specialises in minimally invasive surgery, aiming to provide treatment with a short recovery time.
He is committed to providing cutting-edge personalised care, and you will have direct access to him and his team before, during and after your treatment.
We offer a confidential, professional, and supportive environment where you can feel heard, respected, and fully informed. Whether you require monitoring, minimally invasive treatment, or surgical intervention, we are committed to providing expert care every step of the way.
