Fibroid pain during pregnancy typically feels like a localized, persistent ache or pressure in the pelvic area, lower abdomen, or lower back. It can range from a dull heaviness to sudden, sharp pain depending on what’s happening inside the fibroid itself. Pain is most common in women with fibroids larger than 5 cm and tends to peak during the second and third trimesters.
How the Pain Typically Feels
The everyday baseline of fibroid pain during pregnancy is pelvic pressure or heaviness, sometimes described as a feeling of fullness in the lower belly. Many women feel a steady, aching soreness in the lower abdomen or lower back that doesn’t come and go in waves the way contractions do. The pain tends to stay in one spot, often on the side of the uterus where the fibroid sits, and it may worsen when you stand for long periods, change positions quickly, or have sex.
This kind of chronic pressure happens because the growing uterus and the fibroid compete for space. As the uterus expands to accommodate the baby, it pushes against the fibroid, and the fibroid pushes back against surrounding tissue, nerves, and organs. The result is a deep, heavy sensation that can feel different from the sharp twinges of round ligament pain or the rhythmic tightening of Braxton Hicks contractions.
When Pain Becomes Sudden and Severe
The most intense fibroid pain during pregnancy comes from a process called red degeneration. This happens when a fibroid grows quickly enough that it outstrips its own blood supply. The veins at the edge of the fibroid become blocked, cutting off circulation and causing the tissue inside to break down. It’s essentially a small internal infarction, similar in concept to what happens during a heart attack but confined to the fibroid.
Red degeneration produces acute, sharp abdominal pain that comes on fast. It often feels very different from the slow-building pressure of a growing fibroid. The pain is typically severe, localized directly over the fibroid, and may be accompanied by nausea, vomiting, or a low-grade fever. It can be alarming because it mimics other serious pregnancy complications, but the fibroid itself is the source. This type of episode usually resolves on its own over a period of days to a couple of weeks, though it can be intensely uncomfortable while it lasts.
Why the Second and Third Trimesters Are Worst
Fibroid growth during pregnancy follows a somewhat counterintuitive pattern. About 22% to 32% of fibroids that do grow tend to increase almost exclusively during the first trimester, particularly the first 10 weeks. Yet pain peaks later, in the second and third trimesters. That’s because the expanding uterus creates progressively more pressure on the fibroid, and a fibroid that grew early in pregnancy may not cause pain until months later when space inside the uterus gets tighter.
Data from the NICHD Fetal Growth Studies found that during the second trimester, 51% to 56% of women with visible fibroids experienced increases in total fibroid volume. By the third trimester, though, 50% to 54% of women actually had smaller fibroid volumes than at baseline. Large fibroids in particular shrank in 62% to 67% of cases by the final weeks. So for many women, fibroid-related discomfort eases toward the end of pregnancy as the fibroid itself gets smaller.
How It Differs From Other Pregnancy Pain
Fibroid pain can easily be confused with other common pregnancy discomforts, but there are some practical distinctions. Round ligament pain, one of the most common second-trimester complaints, is a quick, sharp, stabbing sensation on one or both sides of the lower belly. It’s triggered by sudden movements like standing up, rolling over in bed, or coughing, and it passes within seconds to minutes. Fibroid pain, by contrast, is more persistent. It doesn’t resolve with a simple position change and tends to linger for hours or days.
Contractions, whether Braxton Hicks or true labor, produce a tightening sensation across the entire uterus that comes in waves with distinct start and stop points. Fibroid pain stays focused in one area and doesn’t have that rhythmic pattern. If you press on the spot where a large fibroid sits, it may feel tender or firm.
Symptoms that warrant immediate medical attention include pain paired with vaginal bleeding, fever, chills, nausea or vomiting unrelated to morning sickness, or fluid leaking from the vagina. These could point to complications beyond fibroid pain alone.
Rare but Serious: Torsion of a Pedunculated Fibroid
A small number of fibroids grow on a stalk that attaches them to the outside of the uterus. During pregnancy, these pedunculated fibroids can twist on their stalk, cutting off their own blood supply. The pain from torsion tends to build over days to weeks as a worsening, unrelenting ache rather than the sudden onset of red degeneration. Case reports describe women experiencing increasing pain that doesn’t respond to rest, along with tenderness over the area and sometimes digestive symptoms like bloating or nausea. Torsion of a large fibroid during pregnancy is rare, but it requires medical evaluation because it won’t resolve on its own.
What Pregnancy Risks Fibroids Can Raise
A large meta-analysis found that the presence of uterine fibroids during pregnancy increases the risk of several complications. After adjusting for other contributing factors, fibroids were linked to higher rates of preterm birth, cesarean delivery, placenta previa (where the placenta covers the cervix), placental abruption (where the placenta separates from the uterine wall early), postpartum hemorrhage, breech presentation, and preeclampsia. The absolute risk for any individual pregnancy depends on the size, number, and location of the fibroids, but these are the outcomes your provider will be monitoring.
Not every fibroid causes problems. Many women with fibroids have uncomplicated pregnancies and deliveries. But if you’re experiencing significant pain, it’s a signal worth discussing with your care team because it may indicate a larger fibroid, degeneration, or a position that could affect delivery planning.
Managing Fibroid Pain During Pregnancy
Pain management for fibroids during pregnancy is mostly supportive. Rest and hydration are the first-line approach, especially during an episode of red degeneration. Lying on your left side can reduce pressure on major blood vessels and improve circulation to the uterus. A warm (not hot) compress over the painful area may ease localized discomfort.
Your provider may recommend acetaminophen for ongoing pain. For more severe degeneration episodes, short courses of stronger pain relief may be considered depending on the trimester and severity. Surgery to remove fibroids during pregnancy is avoided unless absolutely necessary because of the risk of bleeding and preterm labor. In most cases, the pain from degeneration is self-limiting: the fibroid’s tissue breaks down, the acute episode passes, and the pain gradually fades over one to two weeks.