What Are the Different Types of Fibroids?
There are four main types of fibroid, classified by where they grow in or around the uterus: submucosal, intramural, subserosal, and pedunculated. Each type produces distinct symptoms and requires a different treatment approach.
Intramural fibroids are the most common, growing within the uterine muscle wall. Submucosal fibroids develop just beneath the uterine lining and are most likely to cause heavy bleeding. Subserosal fibroids form on the outer surface of the uterus, often pressing on nearby organs like the bladder.
Understanding which fibroid type you have matters because it directly determines whether you experience pain, bleeding, fertility issues, or no symptoms at all — and it shapes which minimally invasive treatment will work best for your case.
Uterine Fibroids Types Explained by Location and Impact
Fibroids are almost always benign, but their location inside or around the uterus changes everything about how they behave. A fibroid the size of a grape can cause more disruption than one the size of a grapefruit, simply because of where it sits.
Roughly 20% to 80% of women develop fibroids by age 50, according to the U.S. Office on Women’s Health, though many never notice symptoms. The four classifications below cover nearly every case seen in clinical practice.
Submucosal Fibroid
A submucosal fibroid grows just under the inner lining of the uterus (the endometrium) and can bulge into the uterine cavity itself.
This is the least common type — accounting for roughly 5% to 10% of all fibroid cases — but it’s responsible for a disproportionate share of severe symptoms, including:
- Heavy or prolonged menstrual bleeding
- Bleeding between periods
- Anemia from chronic blood loss
- Difficulty conceiving or maintaining a pregnancy
Because submucosal fibroids sit so close to the uterine cavity, even small ones (1-2 cm) can significantly affect fertility and menstrual flow.
Intramural Fibroid
The intramural fibroid is the most frequently diagnosed type, developing directly within the muscular wall of the uterus.
These fibroids can range from pea-sized to larger than a grapefruit, and symptoms typically scale with size:
- Pelvic pressure or a feeling of fullness
- Lower back pain
- Frequent urination if the fibroid presses on the bladder
- Enlarged uterus that may be mistaken for weight gain
Many intramural fibroids stay small and asymptomatic for years, which is why regular pelvic exams matter even in the absence of noticeable symptoms.
Subserosal Fibroid
Subserosal fibroids grow on the outer wall of the uterus and expand outward into the pelvic cavity, sometimes reaching considerable size before causing symptoms.
Because they don’t affect the uterine lining, they rarely cause heavy bleeding. Instead, they tend to produce:
- Pressure on the bladder or bowel
- Constipation or bloating
- Visible abdominal swelling in larger cases
- Backache from pressure on surrounding nerves
Pedunculated Fibroid
A pedunculated fibroid is a subtype of either subserosal or, less commonly, submucosal fibroid that grows on a thin stalk connecting it to the uterus.
This stalk can twist (a condition called torsion), causing sudden, severe pain that sometimes mimics a medical emergency. Pedunculated fibroids growing outward can also press against the bladder or bowel depending on their position.
Comparing the Fibroids Type by Symptom Severity
| Fibroid Type | Location | Common Symptoms | Fertility Impact |
| Submucosal | Inside uterine cavity | Heavy bleeding, anemia | High |
| Intramural | Uterine muscle wall | Pressure, pain, enlarged uterus | Moderate |
| Subserosal | Outer uterine wall | Bladder/bowel pressure, bloating | Low |
| Pedunculated | On a stalk (in or out) | Sudden pain, torsion risk | Varies |
How Fibroid Type Affects Your Treatment Options
Not every fibroid needs treatment. Small, asymptomatic intramural or subserosal fibroids are often simply monitored with periodic ultrasounds.
But when symptoms interfere with daily life, work, or fertility plans, treatment becomes a priority — and the right approach depends heavily on fibroid type, size, and location.
Traditional options like myomectomy or hysterectomy involve surgery, general anesthesia, and weeks of recovery. For many women, a non-surgical alternative delivers comparable results with a fraction of the downtime.
Uterine Fibroid Embolization: A Non-Surgical Path
Uterine fibroid embolization (UFE) is a catheter-based procedure that cuts off blood supply to fibroids, causing them to shrink over time — regardless of whether they’re submucosal, intramural, or subserosal in nature.
The procedure typically involves:
- A small catheter inserted through a tiny incision in the wrist or groin
- Guided imaging to locate the arteries feeding the fibroid(s)
- Injection of tiny particles that block blood flow to the fibroid
- A recovery period of days, not weeks
Patients usually return home the same day and resume normal activities within a week to 10 days, compared to 4-6 weeks for surgical alternatives.
At Mark Medical Care – Fibroids, board-certified specialists evaluate each patient’s specific fibroid type through imaging before recommending a treatment path, since submucosal and larger intramural fibroids sometimes respond differently to embolization than smaller subserosal ones.
For a deeper technical breakdown of how the procedure works step by step, the uterine fibroid embolization page outlines candidacy criteria and expected recovery timelines.
Frequently Asked Questions
Which type of fibroid causes the most bleeding?
Submucosal fibroids cause the most bleeding because they grow directly beneath the uterine lining and disrupt the endometrium during menstruation. Even small submucosal fibroids can trigger heavy or prolonged periods.
Can you have more than one type of fibroid at the same time?
Yes. It’s common for women to have multiple fibroids of different types simultaneously — for example, an intramural fibroid alongside a subserosal one. Imaging like ultrasound or MRI helps map each fibroid’s exact location and type.
Do all fibroid types require treatment?
No. Many fibroids, particularly small subserosal or intramural ones, cause no symptoms and only require monitoring. Treatment becomes necessary when fibroids cause pain, heavy bleeding, fertility problems, or pressure on other organs.
Is uterine fibroid embolization effective for all fibroid types?
UFE works well for most fibroid types, including submucosal, intramural, and subserosal fibroids, since it targets blood flow rather than location directly. A specialist typically reviews imaging to confirm it’s the right fit for your specific case, which is why an evaluation through a consultation is often the first step.
Conclusion
Knowing your specific fibroid type — submucosal, intramural, subserosal, or pedunculated — is the foundation for understanding your symptoms and choosing the right path forward. Location determines everything from bleeding patterns to fertility risk to treatment eligibility.
For women weighing surgery against less invasive options, uterine fibroid embolization offers a proven route to symptom relief without the extended recovery of traditional procedures. Mark Medical Care – Fibroids continues to see patients across New York find real relief once they understand exactly which type of fibroid they’re dealing with and what options exist beyond the operating room.
