Fibroids: Types, Symptoms, Causes, Pregnancy, Treatment

Note: This article is for general education only and is not a substitute for diagnosis, treatment, or personalized medical advice from an OB-GYN or qualified healthcare professional.

Uterine fibroids are the unwanted houseguests of the uterus: usually not dangerous, often quiet, occasionally dramatic, and very good at taking up space without asking permission. Also called leiomyomas or myomas, fibroids are noncancerous growths made of smooth muscle and connective tissue that develop in or around the uterus.

The good news? Most fibroids are benign and many never cause symptoms. The less charming news? When fibroids do act up, they can cause heavy menstrual bleeding, pelvic pressure, bloating, frequent urination, back pain, painful sex, anemia, fertility challenges, and pregnancy concerns. In other words, they can be small tumors with a big personality.

This guide explains the main types of fibroids, common symptoms, possible causes and risk factors, how fibroids may affect pregnancy, and the treatment options available todayfrom watchful waiting to medications, minimally invasive procedures, and surgery.

What Are Fibroids?

Fibroids are growths that form from the muscular wall of the uterus. They can appear as a single lump or as multiple growths. Some are tiny, about the size of a seed. Others can grow large enough to change the shape of the uterus or make the lower abdomen look enlarged.

Although the word “tumor” can sound terrifying, uterine fibroids are almost always noncancerous. They also do not automatically mean a person has, or will develop, uterine cancer. Still, “benign” does not always mean “harmless.” A fibroid in the wrong location can cause more trouble than a larger one sitting quietly elsewhere.

Types of Fibroids

Fibroids are usually classified by where they grow. Location matters because it affects symptoms, fertility, pregnancy risks, and treatment choices.

1. Intramural Fibroids

Intramural fibroids grow within the muscular wall of the uterus. They are among the most common types. Small intramural fibroids may cause no symptoms at all, while larger ones can stretch the uterus, contribute to heavy periods, create pelvic pressure, or make the belly feel swollen.

2. Submucosal Fibroids

Submucosal fibroids grow just beneath the inner lining of the uterus and may bulge into the uterine cavity. These are often the drama queens of the fibroid family. Even when they are not huge, they can cause heavy menstrual bleeding, prolonged periods, bleeding between periods, and fertility problems because they can distort the space where an embryo would implant.

3. Subserosal Fibroids

Subserosal fibroids grow on the outer surface of the uterus. They may not cause heavy bleeding, but they can press on nearby organs. Depending on size and position, they may cause bladder pressure, constipation, lower back pain, or a constant feeling of fullnessas if your pelvis ate a large lunch and forgot to tell you.

4. Pedunculated Fibroids

Pedunculated fibroids grow on a stalk, either inside or outside the uterus. If the stalk twists, it can cause sudden, sharp pain and may require urgent medical evaluation.

Common Symptoms of Fibroids

Many people with fibroids have no symptoms and discover them during a routine pelvic exam or imaging test. Others experience symptoms that interfere with work, sleep, relationships, exercise, and daily life.

Common fibroid symptoms include:

• Heavy menstrual bleeding
• Periods lasting longer than usual
• Bleeding between periods
• Pelvic pain or pressure
• Lower back pain
• Frequent urination
• Difficulty emptying the bladder
• Constipation or rectal pressure
• Pain during sex
• Abdominal bloating or enlargement
• Fatigue, weakness, or shortness of breath from anemia

Heavy bleeding is one of the most common reasons people seek care. Some describe soaking through pads or tampons quickly, passing large clots, or planning their day around bathroom access. If your period requires logistical planning worthy of a NASA launch, it is time to talk with a healthcare provider.

When Fibroids May Be an Emergency

Most fibroid symptoms are not emergencies, but some situations need prompt care. Seek medical help right away if you have severe vaginal bleeding, sudden sharp pelvic pain, dizziness, fainting, extreme weakness, or symptoms of severe anemia. Sudden pain may happen if a fibroid outgrows its blood supply, degenerates, or twists on a stalk.

What Causes Fibroids?

Researchers have not identified one single cause of uterine fibroids. Instead, fibroids appear to develop from a mix of hormones, genetics, cellular changes, and individual risk factors. In plain English: fibroids are complicated, because apparently the uterus enjoys mystery novels.

Hormones

Estrogen and progesterone, the hormones that help regulate the menstrual cycle and prepare the uterus for pregnancy, appear to influence fibroid growth. Fibroids often grow during reproductive years and may shrink after menopause, when hormone levels decline.

Genetics

Fibroids often run in families. If a close relative has had fibroids, your risk may be higher. Some fibroids also show genetic changes in the muscle cells of the uterus.

Age

Fibroids become more common as people move through their 30s and 40s. Symptoms often improve after menopause, though not always immediately.

Race and Health Disparities

Black women are more likely to develop fibroids, often at younger ages, and may experience larger fibroids, more severe symptoms, and a greater need for treatment. The reason is not fully understood and likely involves a complex mix of biology, environment, access to care, and healthcare disparities.

Weight, Blood Pressure, and Lifestyle Factors

Obesity, high blood pressure, and certain dietary patterns have been associated with higher fibroid risk. Diet alone does not “cause” or “cure” fibroids, but a heart-healthy lifestyle may support overall reproductive health and reduce inflammation.

How Fibroids Are Diagnosed

Fibroids are sometimes found during a pelvic exam, especially if the uterus feels enlarged or irregular. To confirm the diagnosis and understand size and location, healthcare providers may recommend imaging or additional tests.

Pelvic Ultrasound

Ultrasound is often the first imaging test used. It can be performed over the abdomen or with a transvaginal probe to create images of the uterus and fibroids.

MRI

Magnetic resonance imaging provides a more detailed view. It may be recommended when fibroids are large, numerous, difficult to map, or when planning a minimally invasive procedure.

Saline Infusion Sonohysterography

This test uses sterile fluid placed inside the uterus during ultrasound to better show the uterine cavity. It can be useful for detecting submucosal fibroids.

Hysteroscopy

During hysteroscopy, a thin viewing instrument is inserted through the cervix to look inside the uterus. It may help diagnose or treat fibroids that project into the uterine cavity.

Blood Tests

If heavy bleeding is present, a provider may order a complete blood count and iron studies to check for anemia or iron deficiency.

Fibroids and Pregnancy

Many people with fibroids have healthy pregnancies and uncomplicated deliveries. However, fibroids can sometimes affect fertility, pregnancy comfort, or delivery plans. The level of risk depends on the number, size, and location of the fibroids.

Can Fibroids Affect Fertility?

Yes, but not always. Submucosal fibroids are most likely to affect fertility because they can distort the uterine cavity and interfere with implantation. Intramural fibroids may also matter if they are large or alter the shape of the uterus. Subserosal fibroids usually have less impact on fertility unless they are very large or located in a problematic spot.

Can Fibroids Grow During Pregnancy?

Some fibroids change size during pregnancy. They may grow, shrink, or stay the same. Hormonal changes and increased blood flow can influence fibroid behavior. If a fibroid grows quickly or loses blood supply, it can cause pain, especially during the second trimester.

Possible Pregnancy Risks

Fibroids may be associated with an increased risk of certain complications, including preterm birth, abnormal placental position, placental abruption, breech position, cesarean delivery, and postpartum hemorrhage. That sounds scary, but context matters: most pregnancies with fibroids do not result in major complications.

Are Fibroids Removed During Pregnancy?

Usually, no. Removing fibroids during pregnancy is uncommon because surgery on the pregnant uterus can increase bleeding and other risks. Treatment during pregnancy typically focuses on monitoring, pain control, and planning delivery based on the fibroid’s size and location.

Treatment Options for Fibroids

There is no one-size-fits-all fibroid treatment. The best option depends on symptoms, fibroid size and location, age, general health, anemia, desire for future pregnancy, and personal preference. The goal is not just to treat an ultrasound image. The goal is to treat the person living with the symptoms.

1. Watchful Waiting

If fibroids are small and not causing symptoms, treatment may not be necessary. A provider may recommend regular checkups and imaging to monitor changes. This approach is common when symptoms are mild or when a person is nearing menopause.

2. Pain Relief and Bleeding Management

Nonsteroidal anti-inflammatory drugs, such as ibuprofen or naproxen, may help with menstrual cramps and pain. They may not significantly shrink fibroids, but they can make symptoms more manageable.

3. Hormonal Birth Control

Birth control pills, hormonal patches, vaginal rings, injections, implants, or hormonal IUDs may help control heavy menstrual bleeding. These methods do not remove fibroids, but they may reduce bleeding and improve quality of life.

4. Tranexamic Acid

Tranexamic acid is a nonhormonal medication used during menstruation to reduce heavy bleeding. It does not shrink fibroids, but for some people it makes periods less overwhelming.

5. GnRH Agonists and Antagonists

Gonadotropin-releasing hormone medications reduce hormone stimulation and may shrink fibroids temporarily or reduce bleeding. They are sometimes used before surgery to improve anemia or make fibroids easier to remove. Because they can cause menopause-like side effects and bone density concerns, they are usually used with careful medical supervision.

6. Iron Therapy

If heavy bleeding causes iron-deficiency anemia, iron supplements or, in more severe cases, iron infusions may be recommended. Treating anemia can improve fatigue, dizziness, headaches, and exercise tolerance.

7. Uterine Artery Embolization

Uterine artery embolization, also called uterine fibroid embolization, is a minimally invasive procedure performed by an interventional radiologist. A small catheter is guided into the arteries supplying the fibroids, and tiny particles are released to block blood flow. Without that blood supply, fibroids shrink and symptoms often improve.

This option can be helpful for heavy bleeding, pelvic pressure, and pain. However, people who want future pregnancies should discuss risks and alternatives carefully with their care team.

8. Radiofrequency Ablation

Radiofrequency ablation uses targeted heat to destroy fibroid tissue and shrink fibroids over time. It may be performed laparoscopically or through the cervix, depending on the technology and fibroid location. Recovery is often shorter than with major surgery.

9. MRI-Guided Focused Ultrasound

This noninvasive treatment uses focused ultrasound waves to heat and destroy fibroid tissue while MRI helps guide the procedure. It is not suitable for every fibroid, but it may be an option for selected patients.

10. Myomectomy

Myomectomy removes fibroids while preserving the uterus. It is often considered for people who want future pregnancy or want to keep their uterus. Myomectomy can be done hysteroscopically, laparoscopically, robotically, or through an open abdominal incision, depending on fibroid size, number, and location.

The important fine print: myomectomy removes existing fibroids, but new fibroids can develop later.

11. Hysterectomy

Hysterectomy, the surgical removal of the uterus, is the only definitive treatment that prevents fibroids from coming back. It may be recommended when symptoms are severe, other treatments have failed, or pregnancy is no longer desired. Because it ends the ability to carry a pregnancy, it is a major decision that deserves a thorough discussion.

Choosing the Right Fibroid Treatment

A good fibroid treatment plan begins with good questions. How heavy is the bleeding? Is anemia present? Is pain the main issue? Are there bladder or bowel symptoms? Is pregnancy desired now, later, or never? Are symptoms disrupting daily life? Is the fibroid inside the uterine cavity, in the wall, or pressing outward?

For example, a 2-centimeter submucosal fibroid causing severe bleeding may need more active treatment than a 6-centimeter subserosal fibroid causing no symptoms. Size matters, but location is the plot twist.

Can Lifestyle Changes Shrink Fibroids?

No diet, supplement, tea, cleanse, or viral social media potion has been proven to reliably eliminate fibroids. If someone promises to “melt fibroids overnight,” your wallet should run faster than your uterus.

That said, lifestyle can still matter. Maintaining a healthy weight, managing blood pressure, eating a balanced diet rich in vegetables and fiber, staying physically active, limiting excess alcohol, and treating anemia can support overall health. These steps may not replace medical treatment, but they can help the body cope better and may reduce some risk factors linked with fibroid growth.

When to See a Doctor

Make an appointment with a healthcare provider if you have heavy or prolonged periods, pelvic pressure, bleeding between periods, pain during sex, frequent urination, constipation, trouble getting pregnant, or symptoms of anemia such as fatigue and weakness.

You do not need to “just live with it.” Heavy bleeding that ruins your clothes, your calendar, or your energy level is not a personality trait. It is a symptom, and it deserves attention.

Patient Experience: What Living With Fibroids Can Feel Like

Living with fibroids can be confusing because symptoms may build slowly. At first, a period is simply “a little heavier.” Then it becomes “annoyingly heavy.” Eventually, someone may realize they are carrying backup pads, extra underwear, dark pants, pain relievers, and the emotional resilience of a medieval knight just to get through a workday.

One common experience is planning life around bleeding. People may avoid long meetings, road trips, gym classes, weddings, flights, or white clothingnot because they are being dramatic, but because they have learned the hard way that fibroid bleeding does not care about timing. A person might sleep on towels, wake up at night to change products, or feel anxious about standing up after sitting for too long.

Another frequent experience is pressure. Fibroids can create a heavy, full feeling in the pelvis, almost like the body is holding a secret bowling ball. Some people describe looking bloated even when they have not eaten much. Others feel like they need to urinate constantly because the fibroid presses on the bladder. This can turn movie theaters, long commutes, and road trips into strategic bathroom-mapping exercises.

Fibroids can also affect emotional well-being. Heavy bleeding may lead to iron-deficiency anemia, which can cause fatigue, brain fog, dizziness, shortness of breath, and low mood. When someone is exhausted all the time, it is easy to blame stress, work, parenting, or “getting older.” But sometimes the body is simply running low on iron because it has been losing too much blood every month.

For people trying to conceive, fibroids can bring a different kind of stress. The uncertainty can be emotionally draining: Will the fibroid affect implantation? Should it be removed before pregnancy? Could surgery delay fertility plans? Is it safe to wait? These questions are deeply personal, and they are exactly why fibroid care should include both medical facts and a person’s reproductive goals.

Pregnancy with fibroids can also feel like walking around with a question mark. Many people do perfectly well, but the diagnosis can create worry. A good care team can help by monitoring fibroid size, checking the placenta and baby’s growth, and discussing delivery planning early. Reassurance matters, but so does having a plan.

Patients often say the most frustrating part is not just the symptomsit is being dismissed. Being told that heavy periods are “normal” can delay diagnosis for years. A better experience starts with taking symptoms seriously. Tracking bleeding days, clot size, pain levels, bathroom frequency, and fatigue can help a provider understand the real impact. Numbers help: how many pads or tampons per day, how many days bleeding lasts, whether clots are larger than a quarter, and whether symptoms interfere with daily activities.

The most empowering moment for many people is learning they have options. Watchful waiting is an option. Medication is an option. Minimally invasive procedures may be options. Myomectomy may preserve fertility. Hysterectomy may be right for someone who wants a definitive solution. The “best” treatment is not the fanciest one; it is the one that fits the person’s symptoms, health, anatomy, and future plans.

If there is one practical takeaway from real-life fibroid experiences, it is this: do not minimize your symptoms just because you have adapted to them. Humans are remarkably good at normalizing discomfort. But needing to organize your life around bleeding, pain, pressure, or fatigue is not something you have to quietly accept. Fibroids may be common, but suffering in silence should not be.

Conclusion

Fibroids are common, usually benign uterine growths that can range from completely silent to seriously disruptive. Their impact depends on type, size, number, and location. Submucosal fibroids often cause heavy bleeding and fertility concerns, intramural fibroids may enlarge or distort the uterus, and subserosal fibroids may create pressure on the bladder, bowel, or pelvis.

The right fibroid treatment depends on the person, not just the scan. Some people need only monitoring. Others benefit from medications, iron therapy, uterine artery embolization, radiofrequency ablation, myomectomy, or hysterectomy. Pregnancy is often healthy with fibroids, but large, multiple, or poorly located fibroids may require closer monitoring.

Most importantly, symptoms deserve respect. If heavy periods, pelvic pressure, pain, anemia, or fertility concerns are affecting your life, talk with an OB-GYN. Fibroids may be common, but your quality of life is not optional.