Fibroids can hurt, but they don’t always. Roughly 25% to 50% of women with fibroids experience symptoms, and pain is one of the most common. The rest may never know they have fibroids unless one shows up on an imaging scan for something else. Whether yours cause pain depends largely on their size, location, and whether they’re actively changing.
What Fibroid Pain Feels Like
Fibroid pain isn’t one single sensation. It shows up in different ways depending on what’s happening inside the uterus. The most common forms include heavy, cramping period pain, a dull pressure or ache in the lower abdomen, back pain, and pain during sex. Some women also experience pain during bowel movements, particularly around their period.
The cramping tends to be worse during menstruation because fibroids increase the production of inflammatory chemicals called prostaglandins, which drive uterine contractions. This can make periods feel significantly more painful than they were before the fibroids developed, even if bleeding hasn’t changed much. Interestingly, research has found that the number, type, and size of fibroids don’t always predict how much menstrual distress a woman experiences. Stress and the heaviness of bleeding play a surprisingly large role in shaping the overall pain experience.
How Location Changes the Symptoms
Where a fibroid sits in the uterus matters more than most people realize. Fibroids growing just beneath the inner lining of the uterus (submucosal fibroids) are especially likely to cause heavy bleeding and intense cramping. Fibroids that grow outward from the uterine wall can press against the bladder or bowel, causing abdominal pressure, constipation, or a constant need to urinate rather than sharp pain.
Fibroids at the top of the uterus (the fundus) have the strongest link to pain during sex. A study of premenopausal women found that 22% of those with fibroids reported deep pain during intercourse, compared to 15% of women without fibroids. Women with fibroids had three times the odds of experiencing severe pain during sex. One explanation is that fundal fibroids may tilt the uterus backward, changing the anatomy enough to make deep penetration uncomfortable. These fibroids are also farthest from the uterus’s main blood supply, making them more prone to tissue stress and inflammation.
Pedunculated fibroids, which hang from a stalk either inside or outside the uterus, deserve special attention. These can twist on their stalk, cutting off their own blood supply. When that happens, the pain is sudden, severe, and localized. Torsion of a pedunculated fibroid is a surgical emergency because delayed treatment can lead to tissue death and serious infection.
When Fibroids Cause Sudden, Severe Pain
The most intense fibroid pain typically comes from something called degeneration. This happens when a fibroid outgrows its blood supply. Without enough oxygen and nutrients, the tissue inside the fibroid starts to break down. The pain is often sharp, severe, and centered right where the fibroid sits. It usually lasts two to four weeks before gradually improving.
A specific type called red degeneration involves bleeding within the fibroid itself. It starts when veins at the fibroid’s edge become blocked, triggering widespread tissue death inside the growth. Red degeneration is particularly common during pregnancy, especially in the second and third trimesters, and most often affects fibroids larger than 5 centimeters. Three things may drive this pain: the fibroid’s tissue dying from lack of blood flow, the growing uterus kinking the blood vessels that feed the fibroid, and the release of inflammatory chemicals from damaged cells.
Nerve Compression and Radiating Pain
Large fibroids can press on nerves in the pelvis, causing pain that radiates well beyond the uterus. Published case reports describe women with lower extremity pain, numbness, tingling, and even difficulty walking caused by fibroids compressing the sciatic nerve or branches of the lumbar nerve plexus. In one case, a 32-year-old woman developed groin and knee pain along with numbness in her inner thigh and frequent knee buckling, all traced back to a large fibroid pressing on pelvic nerves. These symptoms worsened during her period.
This type of nerve-related pain is uncommon but worth knowing about. If you’re experiencing leg pain, tingling, or weakness alongside known fibroids, the fibroid itself could be the source.
Fibroid Pain During Pregnancy
Pain is the most common fibroid complication during pregnancy, particularly for women with fibroids larger than 5 centimeters. The growing uterus changes blood flow patterns, and fibroids that were previously stable may suddenly lose their blood supply and begin to degenerate.
Management during pregnancy is usually conservative: rest, fluids, and pain relief. Anti-inflammatory medications like ibuprofen can be effective because they target the prostaglandins released by damaged fibroid tissue, but prolonged use in the third trimester carries risks for the baby, including effects on fetal heart circulation. In rare cases where pain is unmanageable, surgical removal of the fibroid during pregnancy has been performed safely in the first and second trimesters, though it increases the likelihood of a cesarean delivery.
Managing Fibroid Pain
For everyday fibroid pain and cramping, over-the-counter anti-inflammatory medications are a reasonable first step. They work by lowering prostaglandin levels, which directly addresses both the pain and the heavy bleeding that fibroids can cause. That said, when researchers compared anti-inflammatories to hormonal treatments, the hormonal options were more effective at reducing menstrual blood loss, though the two approaches were comparable for improving pain and quality of life.
Hormonal treatments work by suppressing or stabilizing the hormonal cycles that fuel fibroid growth. These can lighten periods and reduce cramping, but they don’t eliminate fibroids. For women with moderate to severe pain, significant bleeding, or fibroids pressing on the bladder or bowel, procedural options range from minimally invasive approaches that cut off a fibroid’s blood supply to surgical removal of individual fibroids or, in some cases, the uterus itself. The right choice depends on fibroid size and location, symptom severity, and whether you want to preserve fertility.
If your pain is new, suddenly worse, or accompanied by fever, that pattern suggests degeneration or torsion rather than routine fibroid symptoms. Sudden severe pain with a known pedunculated fibroid warrants emergency evaluation, since torsion can progress to tissue death and peritonitis if not treated quickly.