Uterine Fibroids

What is uterine fibroids?

Uterine fibroids are noncancerous (benign) growths that develop in or on the uterus, the muscular organ where a baby grows during pregnancy. They are made of muscle tissue and fibrous connective tissue, which is why doctors sometimes call them fibromas, myomas, or leiomyomas. Although the word “tumor” can sound alarming, uterine fibroids are not cancer, and having fibroids does not mean a person is more likely to develop cancer of the uterus.

Fibroids are very common. Many women develop at least one fibroid during their reproductive years, most often between the ages of 30 and 50. In many cases, fibroids cause no symptoms at all and are only discovered by chance during a routine pelvic exam or an ultrasound performed for another reason. In other cases, fibroids grow large enough or sit in a location that causes heavy bleeding, pelvic pressure, or problems with fertility.

Fibroids vary widely in size, number, and position. A person may have a single fibroid or many, and they can range from the size of a seed to a mass large enough to enlarge the uterus. Doctors often describe fibroids by where they grow:

• Intramural fibroids grow within the muscular wall of the uterus and are the most common type.
• Submucosal fibroids grow just under the inner lining of the uterus and bulge into the uterine cavity. Even small submucosal fibroids can cause heavy bleeding or affect fertility.
• Subserosal fibroids grow on the outer surface of the uterus and may press on nearby organs such as the bladder or bowel.
• Pedunculated fibroids are attached to the uterus by a narrow stalk, either inside the cavity or on the outer surface.

Understanding what is uterine fibroids and how they behave helps patients make informed decisions, because the right approach depends on symptoms, fibroid size and location, age, and whether future pregnancy is desired.

Symptoms of uterine fibroids

Many people with fibroids have no symptoms and never need treatment. When uterine fibroids symptoms do occur, they usually relate to the size, number, and location of the fibroids rather than to how many a person has. Common symptoms include:

• Heavy or prolonged menstrual bleeding, sometimes with clots, which can lead to anemia (a low red blood cell count that causes tiredness and weakness)
• Periods that last longer than a week or bleeding between periods
• Pelvic pressure or a feeling of fullness in the lower abdomen
• Pelvic pain, which may be dull and constant or occasionally sharp
• Frequent urination or difficulty emptying the bladder, when a fibroid presses on the bladder
• Constipation or pressure on the rectum, when a fibroid presses on the bowel
• Backache or leg pain, if a fibroid presses on nerves in the pelvis
• Pain during sexual intercourse
• An enlarged abdomen, sometimes mistaken for weight gain or pregnancy when fibroids are large
• Difficulty becoming pregnant or pregnancy complications in some cases, particularly with submucosal fibroids

Symptoms often differ by fibroid type. Submucosal fibroids, which distort the inner cavity of the uterus, are most closely linked to heavy bleeding and fertility problems, even when they are small. Subserosal fibroids, which grow outward, are more likely to cause pressure symptoms such as frequent urination or a visibly enlarged belly. Intramural fibroids can cause a mixture of both, depending on their size.

Rarely, a fibroid can outgrow its blood supply and begin to break down, a process called degeneration. This can cause sudden, severe pelvic pain and sometimes fever. A pedunculated fibroid can also twist on its stalk, which is another cause of acute pain. Both situations need prompt medical assessment.

Fibroid symptoms often become more noticeable during the reproductive years and may ease after menopause, when hormone levels fall and fibroids tend to shrink. However, this is not guaranteed, and new or worsening symptoms after menopause should always be evaluated by a doctor.

Causes and risk factors

The exact uterine fibroids causes are not fully understood. Research suggests that fibroids develop from a single abnormal muscle cell in the uterine wall that multiplies under the influence of hormones and genetic changes. Several factors appear to play a role:

• Hormones. Estrogen and progesterone, the hormones that regulate the menstrual cycle, promote fibroid growth. This is why fibroids typically appear during the reproductive years, often grow during pregnancy, and usually shrink after menopause.
• Genetic changes. Many fibroids contain gene changes that differ from those in normal uterine muscle cells.
• Family history. Having a mother or sister with fibroids increases a person’s own likelihood of developing them.
• Growth factors. Substances in the body that help tissues grow and repair may also influence fibroid development.

Several risk factors are associated with a higher likelihood of developing fibroids:

• Age, with fibroids most common between roughly 30 and 50 years of age
• Ethnicity, as fibroids tend to occur more often, at younger ages, and with more severe symptoms in women of African descent
• Early onset of menstruation (starting periods at a young age)
• Obesity and higher body weight
• Vitamin D deficiency, which some studies have linked to fibroid risk
• Diet, with some evidence that a diet high in red meat and low in fruits and vegetables may be associated with higher risk
• Never having given birth, as pregnancy appears to have some protective effect in many women

It is important to understand that having risk factors does not mean a person will develop fibroids, and many people with fibroids have no identifiable risk factors. Fibroids are not caused by anything a person did or failed to do.

Diagnosis

Uterine fibroids diagnosis usually begins with a discussion of symptoms and a pelvic examination, during which the doctor may feel that the uterus is enlarged or irregular in shape. Because other conditions can cause similar symptoms, imaging tests are used to confirm the diagnosis and to map the size, number, and location of the fibroids.

Ultrasound

Ultrasound is the most common first test. It uses sound waves to create images of the uterus and can be performed over the abdomen or through the vagina (transvaginal ultrasound), which often gives clearer pictures of the uterus and its lining. Ultrasound can usually confirm the presence of fibroids and measure them.

MRI (magnetic resonance imaging)

MRI provides more detailed images and is often used when fibroids are large or numerous, when the diagnosis is uncertain, or when a procedure or surgery is being planned. MRI shows the precise position of each fibroid in relation to the uterine cavity and surrounding organs.

Hysteroscopy and other tests

Hysteroscopy is a procedure in which a thin, lighted telescope is passed through the cervix into the uterus, allowing the doctor to see the inside of the uterine cavity directly. It is especially useful for detecting submucosal fibroids. A related test, saline infusion sonography, involves placing sterile fluid into the uterus during ultrasound to outline the cavity more clearly.

Blood tests may be ordered to check for anemia caused by heavy bleeding and to rule out other conditions such as thyroid problems or bleeding disorders. In selected cases, a sample of the uterine lining (endometrial biopsy) may be taken to exclude other causes of abnormal bleeding, particularly in older patients or when bleeding patterns are unusual.

Treatment options for uterine fibroids

There is no single best uterine fibroids treatment. The right approach depends on the severity of symptoms, the size and location of the fibroids, the patient’s age, overall health, and whether future pregnancy is desired. Because fibroids often shrink after menopause, age and life stage strongly influence decision-making. Care for this condition is typically coordinated by specialists in gynecology and obstetrics, and detailed information about the condition and its management is also available on the uterine fibroids treatment page.

Watchful waiting

If fibroids cause no symptoms or only mild ones, treatment may not be needed at all. Instead, the doctor may recommend periodic check-ups and ultrasound scans to monitor fibroid size. Many fibroids grow slowly, and some do not grow at all. This approach avoids the risks of medication and surgery when they are not necessary.

Medication

Medications do not remove fibroids, but they can control symptoms and, in some cases, temporarily shrink fibroids. Options a doctor may consider include:

• Nonsteroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen, which can reduce menstrual pain, though they do not reduce bleeding caused by fibroids in most cases.
• Tranexamic acid, a non-hormonal medicine taken during periods to reduce heavy bleeding.
• Hormonal contraceptives, including birth control pills and hormone-releasing intrauterine devices (IUDs), which can lighten periods and control bleeding, though they do not shrink fibroids.
• GnRH agonists and antagonists, medicines that temporarily lower estrogen and progesterone, causing fibroids to shrink. They are usually used for a limited time, often before surgery, because long-term use can cause menopause-like side effects such as hot flashes and bone thinning.
• Iron supplements, when heavy bleeding has caused anemia.

Minimally invasive procedures

Several procedures treat fibroids without traditional open surgery:

• Uterine artery embolization (UAE) blocks the blood vessels that supply the fibroids, causing them to shrink. It is performed through a small catheter inserted into a blood vessel and preserves the uterus, although its effect on future fertility is a topic that should be discussed carefully with a specialist.
• Focused ultrasound therapy uses targeted high-energy sound waves, guided by MRI, to destroy fibroid tissue without incisions. It is suitable only for certain fibroids and patients.
• Radiofrequency ablation uses heat delivered through a small probe to destroy fibroid tissue.
• Hysteroscopic myomectomy removes submucosal fibroids through the vagina and cervix using a hysteroscope, with no abdominal incisions. It is often the preferred approach for fibroids inside the uterine cavity.

Surgery

• Myomectomy is surgery to remove fibroids while leaving the uterus in place. It can be performed through the hysteroscope, by laparoscopy (keyhole surgery through small abdominal incisions), or by open surgery, depending on the fibroids’ size and location. Myomectomy is often chosen by patients who wish to keep the option of pregnancy. New fibroids can develop after myomectomy, so symptoms may return in some cases.
• Hysterectomy is the surgical removal of the uterus. It is the only treatment that fully and permanently eliminates fibroids, but it ends the possibility of pregnancy. It is generally considered for severe symptoms when other treatments have not helped or are not suitable, and when childbearing is complete.

Every treatment has benefits, limitations, and risks. A thorough discussion with a gynecologist, including imaging results and personal priorities such as fertility, is the foundation of a good decision.

Living with uterine fibroids and outlook

For most people, the outlook with uterine fibroids is good. Fibroids are benign, and many cause few or no problems over a lifetime. When symptoms do occur, a wide range of effective treatments exists, from medication to uterus-preserving procedures to surgery.

Living with fibroids often involves managing heavy periods and their consequences. Keeping track of bleeding patterns, watching for signs of anemia such as fatigue, breathlessness, and pale skin, and attending regular follow-up appointments all help. If iron levels drop, your doctor may recommend supplements or dietary changes.

General healthy habits — maintaining a healthy weight, eating a balanced diet rich in fruits and vegetables, and staying physically active — may be helpful for overall health, although no lifestyle change is proven to shrink existing fibroids. Because estrogen and progesterone drive fibroid growth, fibroids commonly shrink after menopause, and symptoms often improve at that stage of life, though this cannot be promised for every individual.

For those hoping to become pregnant, many people with fibroids conceive and carry pregnancies without difficulty. However, certain fibroids, especially those that distort the uterine cavity, can affect fertility or increase the risk of some pregnancy complications. If pregnancy is planned, it is worth discussing fibroids with a doctor beforehand so that any necessary treatment can be timed appropriately.

It is also honest to note that fibroids can recur after uterus-preserving treatments. Regrowth or new fibroids are possible, particularly in younger patients with many years remaining before menopause. Ongoing follow-up allows any recurrence to be detected and managed early.

Frequently asked questions

What is uterine fibroids in simple terms?

Uterine fibroids are benign (noncancerous) growths of muscle and fibrous tissue that form in or on the uterus. They are very common during the reproductive years and range from tiny nodules to large masses. Many cause no symptoms, while others cause heavy periods, pelvic pressure, or fertility difficulties, depending on their size and location.

Can uterine fibroids go away on their own?

Fibroids do not usually disappear during the reproductive years, but they often shrink after menopause when hormone levels fall. Fibroids may also shrink after pregnancy in some cases. Because behavior varies from person to person, doctors often recommend periodic monitoring rather than immediate treatment when symptoms are mild or absent.

How serious are uterine fibroids?

Fibroids are benign and are rarely dangerous in themselves. The main concerns are heavy bleeding that leads to anemia, significant pain or pressure symptoms, and, in some cases, effects on fertility or pregnancy. Rarely, a fibroid can degenerate or twist, causing sudden severe pain that needs urgent care. Most fibroids can be managed effectively once diagnosed.

Are uterine fibroids cancer, or can they turn into cancer?

Fibroids are not cancer, and transformation of a fibroid into cancer is considered extremely rare. A separate, rare cancer of the uterine muscle called leiomyosarcoma can occur, but it is not believed to arise from typical fibroids in most cases. Any rapidly growing uterine mass or unusual bleeding, particularly after menopause, should be evaluated promptly.

Can I get pregnant if I have uterine fibroids?

Many people with fibroids become pregnant and have healthy pregnancies. However, some fibroids — especially submucosal ones that push into the uterine cavity — can make conception harder or raise the risk of complications such as miscarriage or preterm birth. If you have fibroids and are planning a pregnancy, a gynecologist can assess whether treatment before conception may be helpful.

What is the best uterine fibroids treatment?

There is no single best treatment. Options range from watchful waiting and medication to procedures such as uterine artery embolization and surgeries such as myomectomy or hysterectomy. The most suitable choice depends on symptom severity, fibroid size and position, age, and whether you want future pregnancies. A specialist can help weigh the benefits and risks of each option for your situation.

How long is recovery after fibroid surgery?

Recovery depends on the procedure. Hysteroscopic removal of fibroids typically allows a return to normal activities within days. Laparoscopic (keyhole) myomectomy usually involves a recovery of a few weeks, while open abdominal surgery generally requires a longer recovery period. Your surgical team will give guidance tailored to the specific operation and your overall health.

When to see a doctor

Make an appointment with a doctor if you notice possible signs of fibroids, such as heavy or prolonged periods, pelvic pressure or pain that does not go away, an enlarging abdomen, frequent urination, or difficulty becoming pregnant. Early evaluation allows other conditions with similar symptoms to be ruled out and treatment to be planned before complications such as severe anemia develop.

Seek urgent medical attention if you experience any of the following red-flag warning signs:

• Sudden, severe pelvic or abdominal pain, which may indicate a degenerating or twisted fibroid
• Very heavy vaginal bleeding, such as soaking through pads or tampons every hour for several hours in a row
• Signs of severe anemia, including dizziness, fainting, a racing heartbeat, or extreme weakness
• Fever combined with pelvic pain
• Any vaginal bleeding after menopause, which always needs prompt evaluation
• Inability to urinate or sudden severe difficulty emptying the bladder
• Bleeding or severe pain during pregnancy if you are known to have fibroids

These symptoms do not always mean something serious is happening, but they should be assessed by a medical professional without delay so that the cause can be identified and treated appropriately.