Uterine Fibroid

A uterine fibroid is a noncancerous growth made of muscle and fibrous tissue that develops in or on the uterus. Fibroids are common during the reproductive years and may cause no symptoms at all, or they may lead to heavy periods, pelvic pressure, pain, anemia, pregnancy complications, or difficulty conceiving depending on their size and location. For readers coming from a men’s health or fertility perspective, uterine fibroids matter because they can affect a female partner’s reproductive health, implantation, pregnancy outcomes, and the timing or strategy of fertility treatment.

What is a uterine fibroid?
Uterine fibroid at a glance
Why uterine fibroids matter
Types of uterine fibroids
Causes and risk factors
Symptoms and signs
What’s normal vs what’s not?
How fibroids are diagnosed
Fibroids and fertility
Fibroids during pregnancy
Treatment options
Lifestyle and self-management
Common myths
Questions to ask your doctor
Related terms and tests
FAQs
References

What is a uterine fibroid?

Uterine fibroids, also called leiomyomas or myomas, are benign tumors of the uterus. They arise from smooth muscle cells and connective tissue in the uterine wall. According to the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), fibroids are very common and many people do not realize they have them.

Fibroids can be as small as a seed or large enough to distort the uterus. A person may have one fibroid or many. Some remain stable for years, while others grow, shrink, or change over time. They are almost always benign, and they are different from uterine cancer. The concern is usually not cancer risk, but symptoms, fertility effects, bleeding, pressure, and quality of life.

Although fibroids occur in people with a uterus, they are still relevant to men’s health content because male partners often help navigate infertility workups, treatment decisions, pregnancy planning, surgery timing, and the emotional and financial burden of reproductive care.

Uterine fibroid at a glance

Definition: A benign growth of muscle and fibrous tissue in or on the uterus.
Also called: Leiomyoma, uterine myoma, fibromyoma.
Common symptoms: Heavy menstrual bleeding, pelvic pressure, frequent urination, constipation, pain, enlarged abdomen.
Some people have no symptoms: Fibroids are often found incidentally on pelvic exam or ultrasound.
Fertility impact depends on location: Submucosal and cavity-distorting fibroids are more likely to affect implantation and miscarriage risk than small fibroids elsewhere.
Diagnosis: Usually with pelvic ultrasound, and sometimes MRI or hysteroscopy.
Treatment range: Watchful waiting, medications, myomectomy, uterine artery embolization, MRI-guided focused ultrasound, or hysterectomy.
Not the same as cancer: Fibroids are noncancerous, though any rapidly changing or atypical mass still needs medical evaluation.

Why uterine fibroids matter

Fibroids matter because they can affect day-to-day health and reproductive outcomes in several ways:

Bleeding: Heavy or prolonged periods can lead to iron deficiency and anemia.
Pain and pressure: Larger fibroids may press on the bladder, bowel, or pelvic structures.
Fertility: Certain fibroids can interfere with implantation, alter the uterine cavity, or complicate assisted reproduction.
Pregnancy: Fibroids may increase the chance of pain, malpresentation, cesarean delivery, placental issues, and other complications, though many people with fibroids still have healthy pregnancies.
Treatment tradeoffs: Choosing between observation, medication, surgery, or fertility-preserving treatment often requires individualized planning.

The American College of Obstetricians and Gynecologists (ACOG) notes that management depends on symptoms, fibroid size and location, age, and whether future pregnancy is desired.

Types of uterine fibroids

Fibroids are usually classified by where they grow. Location is one of the most important factors in understanding symptoms and fertility effects.

Submucosal fibroids

These grow just beneath the uterine lining and can bulge into the uterine cavity. Even relatively small submucosal fibroids may cause heavy bleeding and may have a greater effect on fertility because they can interfere with implantation or distort the cavity. Guidance from the American Society for Reproductive Medicine (ASRM) has emphasized that cavity-distorting fibroids are the most relevant type when fertility is a concern.

Intramural fibroids

These develop within the muscular wall of the uterus. They are common and may cause bleeding, pain, bulk symptoms, or reduced fertility if they become large enough to alter the cavity or uterine function.

Subserosal fibroids

These grow on the outer surface of the uterus. They are more likely to cause pressure symptoms than bleeding. Small subserosal fibroids usually have less impact on fertility than submucosal fibroids.

Pedunculated fibroids

These are attached to the uterus by a stalk. They can project inward or outward and occasionally cause acute pain if the stalk twists.

Cervical fibroids

These are less common and arise in the cervix. Depending on size and position, they may affect bleeding, intercourse, or delivery planning.

Causes and risk factors

The exact cause of uterine fibroids is not fully understood. Research suggests they likely develop from a combination of genetic changes, hormone signaling, growth factors, and interactions with the surrounding uterine tissue. Fibroids are considered hormone-responsive, especially to estrogen and progesterone, which may help explain why they often grow during reproductive years and may shrink after menopause. The NCBI Bookshelf overview of uterine fibroids and the NICHD both describe these hormonal and genetic influences.

Known or likely risk factors

Age during reproductive years: Fibroids are most common before menopause.
Family history: Having a close relative with fibroids may increase risk.
Race: Fibroids are more common, often more severe, and may appear earlier in Black women, a disparity documented by the NICHD.
Earlier menarche: Starting periods at a younger age may be associated with higher risk.
Obesity or higher body weight: This may contribute through hormonal and inflammatory pathways.
Diet and lifestyle factors: Associations exist, but they do not explain every case and should not be overstated.

None of these factors guarantee that fibroids will develop. Many people with no obvious risk factors still get them.

Symptoms and signs

Many uterine fibroids cause no symptoms. When symptoms do occur, they usually relate to bleeding, bulk, or pressure effects.

Common uterine fibroid symptoms

Heavy menstrual bleeding
Periods that last longer than usual
Pelvic pressure or fullness
Pelvic pain or cramping
Lower back pain
Frequent urination or trouble emptying the bladder fully
Constipation
Pain during sex
Visible abdominal enlargement in some cases
Fatigue related to iron deficiency anemia

Symptoms depend on fibroid location, number, and size. A small fibroid inside the uterine cavity can cause severe bleeding, while a larger fibroid on the outside of the uterus may cause mostly pressure symptoms.

Symptoms that may affect fertility evaluation

Difficulty conceiving
Repeated pregnancy loss in some cases
Failed embryo transfer or implantation concerns during IVF workups
Need for imaging after recurrent miscarriage or infertility

What’s normal vs what’s not?

There is no single “normal size” for a fibroid. The key issue is whether it causes symptoms, distorts the uterine cavity, or contributes to complications.

General interpretation guide

Often less concerning: Small fibroids with no symptoms, especially if they do not distort the uterine cavity.
More concerning: Heavy bleeding, pain, anemia, infertility, recurrent miscarriage, rapid increase in abdominal bulk, urinary or bowel pressure symptoms, or a fibroid that changes treatment planning.
Fertility-specific concern: Submucosal fibroids and intramural fibroids that distort the cavity are generally more important than small subserosal fibroids.

Symptoms and significance table

Finding	What it may mean	Common next step
No symptoms, small fibroid on ultrasound	May not need immediate treatment	Monitor with clinician guidance
Heavy periods and low iron	Bleeding may be clinically significant	Blood tests, iron evaluation, treatment discussion
Fibroid distorting uterine cavity	Higher likelihood of fertility or bleeding impact	Further imaging, hysteroscopy, or surgical discussion
Pelvic pressure and urinary frequency	Bulk effect from larger fibroid	Pelvic imaging and symptom-based treatment planning
Infertility or recurrent miscarriage with fibroids present	Some fibroids may be contributing, especially cavity-distorting ones	Reproductive endocrinology or gynecology review

How fibroids are diagnosed

Fibroids are often first suspected during a pelvic exam or because of symptoms such as heavy periods or pelvic pressure. Imaging is usually needed to confirm the diagnosis and define location.

Common tests used to diagnose uterine fibroids

Pelvic ultrasound: Usually the first-line test. It can show the size, number, and general location of fibroids. The Mayo Clinic describes ultrasound as the most common imaging test for fibroids.
Transvaginal ultrasound: Often gives a more detailed view of the uterus than an abdominal ultrasound.
MRI: Helpful when fibroids are large, numerous, or complex, or when surgery planning is needed.
Hysterosonography (saline infusion sonography): Saline is placed into the uterus during ultrasound to better outline the cavity and identify submucosal fibroids.
Hysteroscopy: A thin camera is passed through the cervix to directly inspect the inside of the uterus.
Lab tests: Bloodwork may be used to check for anemia if bleeding is heavy.

Diagnostic comparison table

Test	Best for	Limitations
Pelvic ultrasound	Initial diagnosis, size and number overview	May miss detailed cavity distortion in some cases
Transvaginal ultrasound	Closer uterine imaging	Not always enough for complex surgical planning
MRI	Detailed mapping and treatment planning	More expensive, not always necessary
Saline infusion sonography	Uterine cavity assessment	Less useful for outer uterine anatomy
Hysteroscopy	Direct view of cavity, diagnosis plus treatment for some submucosal fibroids	Only evaluates inside the uterus

If fertility is part of the discussion, the most important question is often not simply “Do fibroids exist?” but rather “Do they distort the uterine cavity or interfere with implantation or pregnancy?”

Fibroids and fertility

Not all fibroids reduce fertility. This is a key point. Many people with fibroids conceive naturally. The fertility impact depends mostly on location, size, and whether the fibroid alters the uterine cavity or blood flow.

How fibroids may affect fertility

Distorting the shape of the uterine cavity
Interfering with embryo implantation
Altering uterine contractions
Changing local blood flow or the endometrial environment
Blocking the cervix or fallopian tube opening in some cases

Evidence summarized by reproductive medicine societies suggests that submucosal fibroids and intramural fibroids that distort the endometrial cavity are most strongly associated with reduced fertility and increased miscarriage risk. By contrast, small subserosal fibroids generally appear less important for conception outcomes. See the ASRM guidance on myomas and fertility.

Why this matters for couples

If a semen analysis is normal but conception is not happening, or if IVF has failed more than once, evaluation may shift toward the uterine environment. A partner’s fibroids can become a major part of the fertility workup even when male-factor testing is also underway.

When fibroid treatment may be considered in fertility care

Submucosal fibroids are present
Intramural fibroids distort the cavity
There is recurrent implantation failure or recurrent pregnancy loss
The fibroid blocks access to the uterine cavity or cervix
Symptoms such as heavy bleeding or pain are significant

Treatment decisions should be individualized. Removing every fibroid is not automatically beneficial, and surgery itself can carry risks, including scar tissue formation.

Fibroids during pregnancy

Many pregnancies with fibroids are uncomplicated. Still, fibroids can be associated with certain risks depending on their size and location. The NHS and Cleveland Clinic both note that outcomes vary widely.

Possible pregnancy-related issues

Pain from fibroid degeneration or pressure
Bleeding in pregnancy
Placental problems in some cases
Fetal malpresentation, such as breech position
Preterm birth risk in selected cases
Higher chance of cesarean delivery depending on anatomy

Not every fibroid needs treatment before pregnancy. In fact, many do not. The decision depends on symptoms, location, prior reproductive history, and whether the fibroid is likely to interfere with implantation or pregnancy progression.

Treatment options

Uterine fibroid treatment depends on symptoms, reproductive goals, size and location of fibroids, age, and personal preferences. Some people need no treatment at all.

1. Watchful waiting

If fibroids are small and not causing symptoms, clinicians may recommend observation. Follow-up may include repeat exams or imaging if symptoms change.

2. Medication

Medications do not remove fibroids permanently, but they may help manage symptoms.

NSAIDs: Can reduce menstrual pain but usually do not shrink fibroids.
Hormonal birth control: May help bleeding control in some patients.
GnRH agonists or antagonists: Can temporarily shrink fibroids or reduce bleeding, often as a bridge to surgery or short-term symptom control. The Mayo Clinic reviews these options.
Tranexamic acid: May help heavy menstrual bleeding.
Iron supplements: Used when heavy bleeding has caused iron deficiency anemia.

3. Myomectomy

Myomectomy is surgery to remove fibroids while preserving the uterus. It is often the preferred fertility-preserving procedure when fibroids are clearly affecting symptoms or conception. Depending on fibroid location, it may be done hysteroscopically, laparoscopically, robotically, or through an open abdominal incision.

4. Uterine artery embolization

This procedure blocks blood flow to fibroids so they shrink. It can work well for symptom relief, but its role in people actively trying to conceive is more complex and should be reviewed with a fertility-aware specialist.

5. MRI-guided focused ultrasound surgery

This noninvasive treatment uses focused ultrasound energy to target fibroids in selected patients.

6. Endometrial ablation

This may reduce bleeding in some situations, but it is not a fertility-preserving treatment and is not appropriate for people who wish to become pregnant.

7. Hysterectomy

Hysterectomy removes the uterus and is the definitive treatment for fibroids. It ends fertility and is generally reserved for people with severe symptoms who do not want future pregnancy.

Treatment comparison

Treatment	Can preserve fertility?	Main goal	Key limitation
Watchful waiting	Yes	Monitor without intervention	Does not treat symptoms directly
Medication	Sometimes	Control bleeding or shrink temporarily	Fibroids may return to prior size after stopping some drugs
Myomectomy	Yes	Remove fibroids, keep uterus	Surgery risks, possible recurrence
Uterine artery embolization	Uncertain for some fertility goals	Shrink fibroids, relieve symptoms	Not ideal for every patient trying to conceive
Focused ultrasound	Potentially	Noninvasive fibroid destruction	Not suitable for all fibroid types
Hysterectomy	No	Definitive cure	Ends ability to carry pregnancy

Lifestyle and self-management

Lifestyle changes do not reliably eliminate fibroids, but they may help with symptom burden, overall health, and treatment readiness.

Supportive steps that may help

Track menstrual bleeding: Note pad or tampon use, clots, cycle length, and whether bleeding affects work or sleep.
Ask about iron testing: Heavy bleeding can cause iron deficiency even before anemia becomes obvious.
Address pain early: Discuss safe pain-relief options with a clinician rather than simply pushing through severe symptoms.
Maintain overall metabolic health: Weight management, exercise, and balanced nutrition support general reproductive health, even though they are not standalone fibroid cures.
Do not rely on unproven supplements alone: “Natural fibroid shrink” claims are common online but often lack strong evidence.

For couples trying to conceive, it can also help to coordinate timing between fibroid evaluation, semen testing, ovulation tracking, and fertility referral so that one issue is not missed while focusing on another.

Common myths

Myth 1: Fibroids are cancer

Fibroids are benign. They are not the same as uterine cancer. Still, unusual symptoms or imaging findings should always be reviewed by a doctor.

Myth 2: Every fibroid must be removed

Not true. Many fibroids never need treatment. The decision depends on symptoms, location, fertility goals, and the risk-benefit balance of intervention.

Myth 3: Fibroids always cause infertility

Also false. Many people with fibroids conceive naturally. Fertility effects vary a lot by fibroid type and whether the uterine cavity is affected.

Myth 4: A hysterectomy is the only real treatment

No. There are multiple options, including medical therapy, myomectomy, embolization, and observation.

Myth 5: Natural remedies can reliably shrink fibroids

Some lifestyle approaches may help symptoms or overall health, but strong evidence for most marketed supplements and detox plans is lacking.

Questions to ask your doctor

What type of fibroid do I have, and where is it located?
Does it distort the uterine cavity?
Could it be causing my bleeding, pain, or fertility issues?
Do I need an ultrasound, MRI, saline sonogram, or hysteroscopy?
If I want pregnancy, which treatments preserve fertility best?
What are the risks of waiting versus treating now?
Could I become iron deficient or anemic from this bleeding?
If surgery is recommended, what type of myomectomy would be used?
What is the recovery time and how might treatment affect trying to conceive?
How likely is the fibroid to come back after treatment?

Leiomyoma: Another medical term for uterine fibroid.
Myoma: Common shorthand for fibroid.
Adenomyosis: A different uterine condition that can also cause heavy bleeding and pain.
Endometriosis: A separate condition that may overlap with pelvic pain or fertility problems.
Pelvic ultrasound: Standard first-line imaging test.
Transvaginal ultrasound: More detailed uterine imaging.
Saline infusion sonography: Helps evaluate the uterine cavity.
Hysteroscopy: Camera-based cavity evaluation and possible treatment.
Myomectomy: Surgery to remove fibroids while preserving the uterus.
Iron studies and CBC: Blood tests often used when heavy bleeding is present.

FAQs

Can uterine fibroids cause infertility?

They can, but not always. The greatest fertility concern is usually with submucosal fibroids or fibroids that distort the uterine cavity. Many people with other fibroid types still conceive without difficulty.

Are uterine fibroids cancerous?

No. Uterine fibroids are benign growths. They are different from uterine sarcoma and are not generally considered precancerous.

Can fibroids go away on their own?

Some may shrink over time, especially after menopause. Others stay stable or grow. Symptoms often guide whether treatment is needed.

What is the best test for uterine fibroids?

Pelvic ultrasound is usually the first test. MRI, saline infusion sonography, or hysteroscopy may be added if the anatomy is complex or fertility planning is involved.

Do all fibroids need treatment?

No. If a fibroid is not causing symptoms and is not affecting fertility or pregnancy planning, monitoring may be enough.

Can fibroids cause heavy bleeding?

Yes. Heavy or prolonged menstrual bleeding is one of the most common fibroid symptoms, especially with submucosal fibroids.

Is pregnancy possible with fibroids?

Yes. Many people with fibroids have healthy pregnancies. Risk depends on fibroid size, number, and location.

What is the best treatment for fibroids if pregnancy is desired?

That depends on the fibroid type. Myomectomy is often considered when fibroids are clearly interfering with fertility or causing significant symptoms, but it is not automatically necessary for every patient.

Can fibroids come back after removal?

Yes. Myomectomy removes existing fibroids but does not guarantee new fibroids will never develop later.

Can men’s fertility be affected by a partner’s fibroids?

Fibroids do not affect male sperm directly, but they can affect a couple’s overall fertility journey by influencing implantation, miscarriage risk, timing of conception, and treatment decisions.