Uterine Fibroids: Causes, Symptoms, Diagnosis & Treatment Options

Uterine fibroids are non-cancerous growths that develop from the muscle and connective tissue of the uterus. They may grow within the uterine wall, towards the inner cavity or on the outer surface of the uterus. Some remain very small and cause no symptoms, while others may contribute to heavy menstrual bleeding, pelvic pressure, pain or fertility concerns.

Understanding the uterine fibroid meaning, the different types and how fibroids can affect reproductive health can help women make informed decisions about evaluation and treatment. This guide explains what fibroids are, their possible causes, symptoms, diagnosis, treatment options and their potential impact on fertility and pregnancy.

What Are Uterine Fibroids?

If you are wondering what is uterine fibroids, the term refers to benign growths that arise from the muscular tissue of the uterus. They are also called leiomyomas or myomas.

The uterine fibroid meaning is not the same as uterine cancer. Typical fibroids are non-cancerous and may vary greatly in number, size and location.

A woman may have:

• One fibroid or several fibroids
• Very small fibroids
• Larger growths that change the shape of the uterus
• Fibroids in different locations at the same time

Some women never develop noticeable symptoms and learn about fibroids only during an ultrasound or fertility evaluation.

Others may experience heavy menstrual bleeding, pelvic pressure, painful periods, frequent urination or reproductive concerns.

The impact of fibroids depends largely on their size, number and where they are positioned in relation to the uterine cavity.

Types of Uterine Fibroids

The main types of uterine fibroids are classified according to where they develop in relation to the uterine wall.

Location matters because fibroids growing towards the uterine cavity may affect bleeding and fertility differently from fibroids growing towards the outside of the uterus.

Intramural Fibroids

Intramural fibroids develop within the muscular wall of the uterus and are among the most common types. Small intramural fibroids may not cause symptoms, while larger ones can enlarge the uterus and contribute to heavy periods, pelvic pressure or discomfort depending on their size and position.

Submucosal Fibroids

Submucosal fibroids grow towards or into the inner uterine cavity. Even relatively small submucosal fibroids may have a greater effect on menstrual bleeding and reproductive health because they can alter the shape of the cavity where embryo implantation occurs.

Subserosal Fibroids

Subserosal fibroids develop towards the outer surface of the uterus. They may grow outward into the pelvis and are more likely to cause pressure symptoms than heavy bleeding, particularly when they become large or press against the bladder, bowel or surrounding structures.

Some fibroids may also develop on a stalk and are described as pedunculated fibroids.

What Causes Uterine Fibroids?

The exact answer to what causes uterine fibroids is not fully understood.

Researchers believe that several biological factors may contribute to their development and growth.

Hormonal Influences

Fibroids are hormone-sensitive growths.

Oestrogen and progesterone appear to influence fibroid growth, which helps explain why fibroids are most common during the reproductive years and may shrink after menopause when hormone levels decline.

Genetic Factors

Fibroids appear to run in some families.

Women with close relatives who have fibroids may have a higher likelihood of developing them, suggesting that genetic factors play a role.

Cellular and Biological Factors

Differences in the way uterine muscle cells grow and respond to hormones may contribute to fibroid development.

Women often ask what causes uterine fibroids to grow. Growth can vary over time and may be influenced by hormonal exposure, age and individual biological factors.

However, it would be inaccurate to say that one food, lifestyle factor or environmental exposure directly causes fibroids in every woman.

Risk Factors That Increase the Chances of Uterine Fibroids

Risk factors are not the same as confirmed causes. They describe characteristics associated with a greater likelihood of developing fibroids.

Factors that may increase risk include:

• Reproductive age
• Family history of fibroids
• Certain hormonal influences
• Obesity or higher body weight in some women
• Early onset of menstruation
• Individual genetic and biological factors

Fibroids are most often diagnosed during the reproductive years because they respond to ovarian hormones.

Having one or more risk factors does not mean fibroids will definitely develop, and some women with no obvious risk factors may still have them.

Because the exact cause is not completely understood, routine screening is not usually performed in women without symptoms. Evaluation is generally guided by menstrual symptoms, pelvic findings, fertility concerns or imaging performed for another reason.

Symptoms of Uterine Fibroids

Some fibroids cause no symptoms at all.

When symptoms occur, they depend largely on the size, number and location of the fibroids.

Common symptoms of uterine fibroids include:

• Heavy menstrual bleeding
• Prolonged periods
• Painful periods
• Pelvic pressure or heaviness
• Lower abdominal discomfort
• Abdominal enlargement
• Frequent urination
• Constipation
• Lower back discomfort
• Pain during intercourse
• Fertility or pregnancy concerns in some women

Heavy bleeding is one of the more common uterine fibroids symptoms, particularly when fibroids affect the uterine cavity.

Large fibroids may press against nearby organs. Pressure on the bladder may lead to frequent urination, while pressure towards the bowel may contribute to constipation or pelvic fullness.

Other signs of uterine fibroids can include tiredness, weakness or symptoms related to iron-deficiency anaemia when menstrual blood loss is significant.

Importantly, these symptoms are not unique to fibroids. Adenomyosis, endometriosis, hormonal conditions and other gynaecological problems may cause similar symptoms, so medical evaluation is needed for an accurate diagnosis.

How Are Uterine Fibroids Diagnosed?

Uterine fibroids diagnosis usually begins with a detailed discussion of symptoms and menstrual history.

A healthcare professional may ask about:

• Menstrual flow
• Duration of bleeding
• Pelvic pain or pressure
• Urinary or bowel symptoms
• Reproductive plans
• Previous pregnancies
• Fertility concerns

A pelvic examination may sometimes suggest that the uterus is enlarged or irregular.

Ultrasound

Pelvic ultrasound is commonly used to evaluate the uterus and identify fibroids.

Depending on the clinical situation, abdominal or transvaginal ultrasound may help determine:

• Number of fibroids
• Size
• Location
• Relationship to the uterine cavity

Additional Tests

Further imaging or procedures may be recommended when more detail is needed, particularly if a fibroid appears to affect the uterine cavity or fertility treatment is being planned.

The purpose of diagnosis is not simply to confirm that fibroids are present. It also helps determine whether the fibroids are likely to explain the symptoms and whether treatment is needed.

Options for Uterine Fibroids Treatment

Uterine fibroids treatment is individualised.

Not every fibroid needs treatment. Small fibroids that do not cause symptoms or fertility concerns may simply be monitored.

Treatment decisions depend on:

• Symptoms
• Amount of bleeding
• Fibroid size
• Number of fibroids
• Location
• Age
• Anaemia
• Reproductive plans
• Overall health

Observation

If fibroids are not causing significant symptoms, regular follow-up may be appropriate.

Monitoring can help determine whether symptoms or fibroid size change over time.

Medicines

Medicines may be used to manage symptoms such as:

• Heavy menstrual bleeding
• Menstrual pain
• Anaemia

Some hormonal treatments can help control bleeding, although they may not permanently remove fibroids.

The choice of medicine depends on symptoms, medical history and whether pregnancy is currently being planned.

Minimally Invasive Procedures

Selected patients may be considered for procedures aimed at reducing fibroid-related symptoms.

The suitability of these approaches depends on fibroid location, reproductive plans and overall clinical circumstances.

Myomectomy

Myomectomy is surgery to remove fibroids while preserving the uterus.

It may be considered when fibroids are causing significant symptoms or when their location is thought to affect fertility.

The surgical approach depends on the size and position of the fibroids.

Hysterectomy

Hysterectomy removes the uterus and is a definitive treatment for fibroids, but it is generally considered when appropriate and when future pregnancy is not desired.

For women planning pregnancy, fertility-preserving options are considered whenever clinically suitable.

Can Uterine Fibroids Affect Fertility or Pregnancy?

Fibroids do not automatically cause infertility.

Many women with fibroids conceive naturally and have uncomplicated pregnancies.

The effect on fertility depends mainly on:

• Fibroid size
• Location
• Number
• Whether the uterine cavity is distorted
• Whether other fertility factors are present

Submucosal fibroids, or fibroids that significantly alter the uterine cavity, tend to have greater reproductive significance because they may interfere with implantation.

Large intramural fibroids may also be relevant in selected cases, particularly if they distort the uterine cavity.

Fibroids may also be associated with some pregnancy complications depending on their size and location, but the effect varies considerably.

Women with fibroids who are experiencing difficulty conceiving may need a complete fertility assessment rather than assuming that fibroids are the only cause.

Depending on the overall findings, treatment may include surgery, IUI treatment, IVF treatment or, in selected situations, ICSI treatment.

Are Uterine Fibroids Dangerous?

Typical uterine fibroids are benign.

They may cause significant symptoms, including heavy bleeding, pain, anaemia or pressure on surrounding organs, but they are not considered cancerous growths.

The presence of fibroids does not mean that uterine cancer will develop.

However, a new or rapidly changing uterine mass, particularly after menopause, should be properly evaluated rather than automatically assumed to be a fibroid.

Medical assessment is also important when symptoms change unexpectedly, bleeding becomes unusually heavy or pelvic pain becomes severe.

Prevention of Uterine Fibroids

There is no guaranteed way to prevent uterine fibroids because their exact cause is not completely understood.

Healthy habits such as balanced nutrition, regular physical activity and maintaining overall metabolic health are beneficial for general well-being, but they should not be presented as proven methods to prevent fibroids.

More useful steps include:

• Attending regular healthcare appointments
• Discussing unusually heavy periods with a healthcare professional
• Seeking evaluation for persistent pelvic pressure or pain
• Testing for and treating iron deficiency when appropriate
• Obtaining appropriate imaging when symptoms warrant it

Early evaluation can help identify fibroids and determine whether monitoring or treatment is needed.

When Should You See a Doctor for Uterine Fibroids?

Consider speaking with a gynaecologist if you experience symptoms that may be associated with fibroids, particularly persistent heavy menstrual bleeding, pelvic pressure, pelvic pain or changes in your menstrual cycle.

A fertility evaluation may also be appropriate if you have fibroids and are having difficulty conceiving or have experienced recurrent pregnancy loss.

Seek prompt medical attention if you experience very heavy bleeding, severe pelvic pain, dizziness, fainting or other symptoms that may indicate significant blood loss or another urgent condition.

Conclusion

Uterine fibroids are common benign growths that can vary considerably in size, number and location. Some women have no symptoms, while others may experience heavy periods, pelvic pressure, pain or fertility concerns.

Understanding the type and location of a fibroid is important because these factors can influence symptoms, fertility and treatment decisions. Not every fibroid requires treatment, and management may range from observation and medicines to procedures or surgery when appropriate.

If you have symptoms of fibroids or concerns about fertility, a gynaecologist or fertility specialist can evaluate your individual situation and recommend an appropriate management plan.