Fibroids symptoms vary considerably — from no symptoms at all in most women to severe, life-disrupting heavy bleeding, pelvic pain, and reproductive challenges in others. Uterine fibroids (also called leiomyomas or myomas) are benign (non-cancerous) growths that develop in or on the muscular wall of the uterus 1.
They are the most common benign uterine tumor, occurring in up to 70–80% of women by age 50, though only 25–50% develop symptoms that require intervention 1. Fibroids vary widely in size, number, and location within the uterus, which largely determines the type and severity of symptoms.
African American women are disproportionately affected — they develop fibroids more frequently, at younger ages, and tend to have more severe symptoms 2. This page describes the full range of fibroid symptoms, how they are diagnosed, and when treatment is warranted. For comprehensive women's health information, visit the women's health hub.
Types of Uterine Fibroids and Their Locations
Fibroid location is a primary determinant of the type of symptoms they cause:
- Submucosal fibroids: Grow just beneath the inner lining of the uterus (endometrium). Even small submucosal fibroids can cause significant heavy bleeding and interfere with fertility and implantation 1.
- Intramural fibroids: Develop within the muscular uterine wall. The most common type. Large intramural fibroids may enlarge the uterus and cause pressure symptoms.
- Subserosal fibroids: Grow on the outer surface of the uterus. May push against adjacent organs (bladder, bowel), causing urinary or bowel symptoms.
- Pedunculated fibroids: Attached to the uterus by a stalk; can be subserosal or submucosal. If the stalk twists (torsion), this can cause acute, severe pain.
- Cervical fibroids: Less common; located in the cervix and may cause pain during intercourse or complicate childbirth.
Common Fibroids Symptoms
Heavy or Prolonged Menstrual Bleeding
Heavy menstrual bleeding (menorrhagia) is the most common symptom of uterine fibroids, particularly submucosal fibroids that alter the endometrial lining. Affected women may soak through a pad or tampon every hour for multiple hours, pass large blood clots, or have periods lasting more than 7 days 1. Chronic heavy bleeding can cause iron-deficiency anemia, producing fatigue, dizziness, and shortness of breath.
Many women underestimate the severity of their bleeding because they have not had a frame of reference for what is normal — see our detailed guide on heavy period causes and when to seek care for more context. Heavy menstrual bleeding always warrants evaluation.
Pelvic Pain and Pressure
Pelvic pressure, heaviness, or a feeling of fullness — particularly in the lower abdomen — is common with larger fibroids. Some women describe it as similar to being several months pregnant, which may be accurate: large fibroids can enlarge the uterus to the size of a second-trimester pregnancy. Sharp or acute pelvic pain may occur if a pedunculated fibroid undergoes torsion, or during menstruation. Chronic pelvic pain is less specific than heavy bleeding but warrants investigation.
Urinary Symptoms
Subserosal fibroids that press against the bladder may cause:
- Urinary frequency or urgency (needing to urinate often or suddenly)
- Difficulty emptying the bladder completely
- Increased nocturia (nighttime urination)
Rarely, large fibroids may compress the ureters — the tubes connecting the kidneys to the bladder — potentially affecting kidney function, which requires medical evaluation 3.
Bowel Symptoms
Posterior fibroids pressing against the rectum may cause:
- Constipation or difficulty with bowel movements
- A feeling of rectal pressure or incomplete evacuation
- Painful defecation
These symptoms can overlap with irritable bowel syndrome or other gastrointestinal conditions, making fibroid evaluation important in women with new or unexplained bowel symptoms alongside menstrual changes.
Pain During Intercourse
Dyspareunia (painful intercourse), particularly pain felt deep in the pelvis, can occur with fibroids — especially cervical, submucosal, or large intramural fibroids. This symptom also occurs with other gynecological conditions including endometriosis symptoms and causes and ovarian cysts, and warrants clinical evaluation to identify the cause.
Fertility and Pregnancy Complications
While many women with fibroids conceive and carry pregnancies without complications, certain fibroid locations and sizes are associated with reduced fertility and obstetric risks. Submucosal fibroids that distort the uterine cavity are most consistently linked to implantation failure and early pregnancy loss 1.
Women with uterine abnormalities and heavy bleeding may also want to rule out adenomyosis symptoms, which can coexist with fibroids. Large intramural fibroids may affect uterine blood flow.
During pregnancy, fibroids can grow (especially in the first trimester), and may cause pain, contribute to abnormal fetal positioning, increase the risk of preterm labor, or necessitate cesarean delivery 2.
When Fibroids Cause No Symptoms
The majority of uterine fibroids are discovered incidentally during pelvic examination or ultrasound performed for another reason. Asymptomatic fibroids — particularly small ones — typically require monitoring rather than treatment 1. They may shrink after menopause as estrogen levels decline.
Healthcare providers can discuss whether watchful waiting, monitoring with periodic imaging, or treatment is appropriate based on fibroid size, location, rate of growth, and individual circumstances including plans for future pregnancy.
Diagnosis
Fibroids are most commonly diagnosed by pelvic ultrasound (transabdominal or transvaginal), which can identify their size, number, and location 3. Additional imaging — including MRI — provides more detailed information about fibroid characteristics and is often used in planning treatment. Other diagnostic tools include:
- Sonohysterography (saline infusion sonography): Fluid injected into the uterus enhances visualization of the uterine cavity, useful for detecting submucosal fibroids
- Hysteroscopy: A thin camera inserted through the cervix into the uterus; allows direct visualization and biopsy if needed
- Blood tests: A complete blood count (CBC) assesses for iron-deficiency anemia from blood loss
When to See a Doctor
Contact a healthcare provider if you experience:
- Heavy menstrual bleeding — soaking through a pad or tampon every 1–2 hours for multiple consecutive hours, or passing blood clots larger than a quarter 2
- Pelvic pain or pressure that is persistent, severe, or worsening
- Sudden, acute pelvic pain (may indicate fibroid torsion or degeneration)
- Menstrual periods lasting longer than 7 days
- Urinary symptoms that are new or worsening
- Difficulty becoming pregnant or recurrent pregnancy losses
- A pelvic mass felt by yourself or during a routine exam
- Fatigue, dizziness, or shortness of breath that may indicate anemia from blood loss
Fibroids rarely become malignant — uterine sarcoma is a separate and rare condition — but symptoms warrant evaluation both to confirm the diagnosis and to rule out other causes of abnormal uterine bleeding. Understanding irregular period causes and spotting between periods can also help contextualize any changes in your cycle.
Frequently asked questions
What do fibroid symptoms feel like?
The most common fibroid symptoms include heavy menstrual bleeding with or without large clots, a feeling of pressure or fullness in the lower abdomen, pelvic pain or cramping, and urinary frequency. Some women describe the abdominal pressure as a constant heaviness. Symptoms vary based on fibroid location and size — submucosal fibroids primarily cause heavy bleeding, while larger fibroids cause pressure-related symptoms.
Can fibroids cause pain all month, not just during periods?
Yes. While many fibroid-related symptoms peak around menstruation, pressure-type pain from large fibroids can be present throughout the month. Degeneration of a fibroid — which can occur when a rapidly growing fibroid outgrows its blood supply — may cause acute, severe pain at any point in the cycle. Pedunculated fibroid torsion also causes pain unrelated to the menstrual cycle.
Are fibroids dangerous?
Uterine fibroids are almost always benign and are not associated with increased cancer risk. However, they can cause significant health problems including severe anemia from blood loss, interference with fertility, and complications during pregnancy. In rare cases, large fibroids causing urinary obstruction can affect kidney function. The danger is not from the fibroids themselves becoming malignant but from the complications of untreated symptoms.
Do fibroids go away on their own?
Fibroids often stabilize or shrink after menopause when estrogen levels decline. Before menopause, they do not typically resolve spontaneously, though they may remain stable in size for years without causing worsening symptoms. Some smaller fibroids discovered incidentally are monitored without treatment if they cause no symptoms. Treatment is pursued when symptoms affect quality of life, cause anemia, or interfere with fertility.