Uterine Fibroids: Symptoms, Diagnosis & Treatment Guide

If you've been told you have a "fibroid" or you've been dealing with periods that are heavier, longer or more painful than they used to be, you are not alone — and you are almost certainly not in danger. Uterine fibroids are one of the most common gynecologic conditions in the world, affecting a majority of women at some point in their lives, and they are treatable.

This guide walks through what fibroids actually are, the symptoms of uterine fibroids to recognize, how doctors diagnose them, the full range of modern treatment options, and what fibroids can mean for fertility, pregnancy and long-term health. The aim is to leave you informed and calm rather than anxious and Googling at 2 a.m.

A note up front, and we'll come back to it: this article is educational, not medical advice. Fibroids need to be diagnosed and managed by a qualified clinician who knows your history. We're the team behind Vyve, a private, on-device AI cycle tracker — but nothing here is a diagnosis, and Vyve is a tracking tool, not a diagnostic one.

What are uterine fibroids, exactly?

Uterine fibroids (also called myomas or leiomyomas) are non-cancerous growths made of smooth muscle and connective tissue that develop in or on the wall of the uterus. They can be as tiny as a seed or as large as a grapefruit, and you can have one or many. Despite the alarming size range, fibroids are almost never cancerous — the rare malignant version (leiomyosarcoma) is a separate entity.

Fibroids are extraordinarily common. By age 50, up to 70–80% of women will have developed at least one, though many will never know because their fibroids caused no symptoms. They tend to appear most often between the mid-30s and the 50s, and they usually shrink after menopause when estrogen and progesterone levels fall. In other words: fibroids are hormone-fed, and the same hormones that shape your cycle also feed them.

Two things are worth internalizing. First, "fibroid" is not a synonym for "problem." Small, symptomless fibroids often need no treatment at all. Second, fibroids are not caused by anything you did — not stress, not diet, not a lifestyle choice. They are a biological phenomenon rooted in hormones and genetics.

Types of fibroids (location changes everything)

How much trouble a fibroid causes depends less on its size than on where it sits. Clinicians usually classify fibroids by location:

• Submucosal fibroids grow just under the uterine lining and can bulge into the uterine cavity. They are the smallest group but the most likely to cause heavy bleeding and to affect fertility.
• Intramural fibroids develop within the muscular wall of the uterus and are the most common type. Depending on size, they can cause bleeding, pressure or cramping.
• Subserosal fibroids grow on the outer surface of the uterus. They may cause pressure on nearby organs (bladder, bowel) but often don't affect bleeding.
• Pedunculated fibroids hang from a stalk, either inside or outside the uterus. On a stalk, they can occasionally twist, causing acute pain.
• Cervical fibroids grow in the tissue of the cervix and are less common.

The takeaway: a small submucosal fibroid can cause more havoc than a much larger subserosal one. That's why an ultrasound report matters as much for location as for size.

Common symptoms of uterine fibroids

Many fibroids are completely silent. When they do cause symptoms, the most common are:

• Heavy menstrual bleeding — soaking through pads or tampons within an hour, needing double protection, or passing large blood clots.
• Prolonged periods that last longer than seven days.
• Pelvic pressure or fullness — a feeling that something is bearing down in your lower belly.
• Pelvic pain or cramping that can occur with or between periods.
• Frequent urination or difficulty completely emptying the bladder (from a fibroid pressing forward).
• Constipation or bowel pressure (from a fibroid pressing backward).
• Lower back or leg pain from large fibroids.
• Pain during sex, especially in certain positions.
• Fatigue from iron-deficiency anemia caused by heavy bleeding.
• Abdominal enlargement — a bulkier lower belly that doesn't respond to diet changes.

None of these symptoms alone means you have fibroids, and they overlap with other conditions like adenomyosis, endometriosis, uterine polyps and hormonal disorders. That overlap is precisely why a clinician needs to look at the whole picture rather than pattern-match a symptom list.

What causes fibroids?

The precise cause of fibroids isn't fully understood, but the picture is clearer than it used to be. Fibroid growth is fed by estrogen and progesterone, which is why they typically grow during reproductive years and shrink after menopause. Genetics also play a major role — if your mother or sister had fibroids, your risk is higher, and specific gene changes have been identified in fibroid tissue. Race is a significant factor: Black women are diagnosed with fibroids at higher rates, at younger ages and with more severe symptoms, for reasons researchers are still investigating.

Other associated factors include age (risk rises through the 30s and 40s), early age at first period, obesity, vitamin D deficiency and diet patterns high in red meat and low in green vegetables. Pregnancy and hormonal contraception can influence fibroids in either direction. None of these are "your fault," and none of them predict individual outcomes reliably — they are population trends, not personal verdicts.

Fibroids are not caused by something you did. They are hormone-fed, genetically influenced growths that a majority of women develop by midlife — most of the time without symptoms.

How fibroids are diagnosed

Fibroids are often discovered during a routine pelvic exam, when a clinician notices the uterus feels enlarged or irregularly shaped. From there, confirming the diagnosis usually involves imaging:

• Pelvic ultrasound (transabdominal or transvaginal) is the standard first-line test. It shows the uterus and any fibroids, their approximate size and location.
• Saline-infusion sonography (SIS) or hysterosonography introduces sterile fluid into the uterus during ultrasound to better see submucosal fibroids and polyps.
• MRI gives detailed maps of fibroid size, number and location — especially useful before surgery or a minimally invasive procedure.
• Hysteroscopy uses a thin camera passed through the cervix to look directly inside the uterus and can also remove certain fibroids.
• Blood tests may check for anemia if heavy bleeding is a concern.

Your clinician will use these to build a complete picture — how many fibroids there are, where they sit, how big they are, and how they line up with your symptoms. That map determines what, if anything, to do about them.

Treatment options for fibroids

Fibroid treatment is genuinely a menu, not a single path. The right choice depends on your symptoms, fibroid size and location, age, fertility goals and personal preference. Broadly, options fall into four buckets:

1. Watchful waiting. For small, symptomless fibroids — or fibroids close to menopause when they're likely to shrink naturally — the best treatment is often no treatment. You and your clinician monitor them periodically, and act only if things change.

2. Medications. Several medication options can help manage symptoms without removing fibroids. These include hormonal contraception (which can reduce heavy bleeding), progestin-releasing IUDs, tranexamic acid to reduce bleeding on period days, NSAIDs for pain and cramping, and GnRH-modulating medications that temporarily shrink fibroids by lowering estrogen (often used before surgery). We're not naming specific brands or doses — that's your clinician's job — but the point is that pharmacological options exist and can be significant.

3. Minimally invasive procedures. Techniques that shrink or destroy fibroids without traditional surgery include uterine artery embolization (tiny particles injected to block blood flow to fibroids), MRI-guided focused ultrasound (uses sound waves to heat and destroy fibroid tissue), radiofrequency ablation and endometrial ablation (destroys the uterine lining to reduce bleeding, but only when fertility is no longer desired).

4. Surgery. When medications and procedures aren't enough or aren't appropriate, surgical options remove fibroids or the uterus itself. These deserve their own section below.

Surgical options in depth

Myomectomy removes fibroids while preserving the uterus, making it the go-to option for people who want to keep the option of pregnancy. It can be done hysteroscopically (through the cervix, for submucosal fibroids), laparoscopically or robotically (through small abdominal incisions), or via traditional open surgery for very large or numerous fibroids. Fibroids can recur after myomectomy, though many people go years symptom-free.

Hysterectomy removes the uterus entirely. It is the only truly permanent cure for fibroids, and it's an option only for people who are certain they don't want future pregnancy. It can be performed vaginally, laparoscopically, robotically or through an open incision. Modern approaches are far less invasive than the surgery of past decades, and recovery is typically faster than most people expect — but it's a major decision that deserves careful conversation.

Fibroids, fertility and pregnancy

Most people with fibroids conceive and carry healthy pregnancies. However, certain fibroids can affect fertility or pregnancy: submucosal fibroids that distort the uterine cavity can interfere with implantation; large fibroids can block fallopian tubes; and some fibroids grow during pregnancy under the influence of pregnancy hormones. Complications during pregnancy can include pain, higher risk of miscarriage in some cases, breech position, preterm labor or a higher chance of cesarean delivery.

If you have fibroids and are trying to conceive, are pregnant, or want to plan a pregnancy in the future, work with your obstetrician or a fertility specialist. Some fibroids are best removed before conception; others are best left alone. It's a highly individual decision, and generic advice can steer you wrong.

When to see a doctor

See a clinician if you notice any of the following, whether or not you suspect fibroids:

• Periods that soak through a pad or tampon in less than two hours, or bleeding lasting longer than a week.
• Passing very large blood clots — larger than a quarter — regularly.
• Persistent pelvic pain, pressure or fullness in the lower belly.
• Frequent urination, difficulty emptying the bladder, or new bowel changes without another explanation.
• Fatigue, dizziness or shortness of breath, which may signal anemia.
• Any bleeding between periods, after sex, or after menopause.
• Trouble conceiving after trying for a while, or before starting to try if you know you have fibroids.

The earlier you start the conversation, the more treatment options you have. And the most useful thing you can bring is an honest, tracked record of your cycles, bleeding patterns and symptoms over months.

How Vyve helps you track fibroid symptoms

Knowing about fibroids is one thing; having a clear record of how they affect your body is what actually changes appointments and decisions. Vyve is a private, on-device AI cycle tracker built to handle exactly this kind of tracking — flow heaviness, clot size, pain patterns, cycle length changes, and how symptoms cluster around your period.

Vyve is a tracking tool, not a diagnostic one. It won't tell you whether you have fibroids. What it does is help you see your patterns clearly, spot when things are changing, and hand your doctor a doctor-ready report that starts the conversation from real data instead of vague recollection. The AI runs on your device, your data is encrypted and stays on your phone, and there is no required account.

Frequently asked questions

What are uterine fibroids?

Uterine fibroids are non-cancerous growths made of smooth muscle and connective tissue that develop in or on the wall of the uterus. They range from tiny seedlings to bulky masses, are extremely common in women aged 30–50, and many cause no symptoms at all.

What are the main symptoms of uterine fibroids?

The most common symptoms are heavy or prolonged menstrual bleeding, pelvic pressure or pain, urinary frequency, constipation, back or leg pain, pain during sex, and fatigue from anemia. Many fibroids cause no symptoms and are only found on imaging done for other reasons.

What causes uterine fibroids?

Fibroids grow in response to estrogen and progesterone, tend to run in families, and are more common and more severe in Black women. Age, obesity, early first period and vitamin D deficiency are associated with higher risk, but no lifestyle choice "causes" fibroids.

Do fibroids affect fertility or pregnancy?

Most people with fibroids conceive and carry healthy pregnancies, but certain fibroids — particularly submucosal ones — can reduce fertility or complicate pregnancy. If you have fibroids and are trying to conceive or already pregnant, work with your obstetrician or fertility specialist.

How are uterine fibroids treated?

Treatment depends on symptoms, fibroid size and location, age and fertility goals. Options include watchful waiting, medications, minimally invasive procedures like uterine artery embolization or MRI-guided focused ultrasound, and surgery such as myomectomy or hysterectomy. There is no single best treatment.