Discovering fibroids during pregnancy can turn an exciting ultrasound into a frightening moment. You may worry about miscarriage, harm to the baby, or cesarean delivery. Pelvic pressure or pain can also disrupt sleep, walking, work, and your ability to enjoy the pregnancy.
Before pregnancy, symptoms may have been managed with medication, hormones, or observation. Those choices change after conception, and apparently ordinary discomfort may need assessment. Imaging helps distinguish fibroid pain from other pregnancy complications.
At Hackensack Center for Minimally Invasive Gynecologic Surgery, Dr. Adam Shoman, MD, FACOG, MBA, has more than 15 years of experience with fibroids and surgery. His MIGS-focused approach helps determine whether treatment belongs before a future pregnancy or after delivery. Current pregnancy care remains with the obstetric team.
What Happens to Fibroids During Pregnancy?
Fibroids are noncancerous growths of uterine muscle and connective tissue. Some grow early as hormones and blood flow change, many remain stable, and others shrink later or after delivery.
Growth does not automatically mean danger. Location, number, size, and relationships to the cavity, placenta, cervix, and baby are more informative. A lower-uterine fibroid differs from several small outward-growing fibroids.
Common fibroid locations include:
- Submucosal fibroids project toward the cavity. Because they change the implantation space, they may be more relevant to miscarriage than outward-growing fibroids.
- Intramural fibroids grow within the uterine wall. Size, cavity distortion, and closeness to the placenta affect their significance. Many cause no major problem.
- Subserosal fibroids grow outward. They are less likely to change the cavity but may cause pressure or pain as the uterus enlarges.
The uterine fibroids resource explains nonpregnancy treatment in greater depth.
Can Fibroids Cause Miscarriage?
Fibroids are associated with miscarriage in some circumstances, but most patients with fibroids do not miscarry because of them. Early loss is often related to chromosome problems in the pregnancy—not something the patient did.
Risk may be more concerning when a fibroid distorts the cavity, lies beneath the lining, is large, or sits near the placenta. A known fibroid should not automatically be blamed for a loss, and removal cannot guarantee prevention.
Several issues must be considered:
- Number and position matter. A cavity-distorting growth differs from one on the outer surface. Ultrasound must be interpreted with pregnancy history.
- Other explanations remain possible. Age, chromosome differences, uterine shape, hormonal conditions, and medical factors may contribute. Finding fibroids should not end the investigation.
- Bleeding does not always mean miscarriage. Spotting can occur in continuing pregnancies but still requires assessment. Ultrasound evaluates what symptoms alone cannot.
- Treatment requires caution. Surgery during pregnancy is uncommon because the uterus has increased blood flow. Definitive care is usually planned before conception or after delivery.
After repeated losses, a broader infertility and reproductive evaluation may be appropriate.
Other Pregnancy Complications Associated With Fibroids
Many pregnancies with fibroids progress normally. Complication risks vary with the fibroid pattern and other pregnancy factors; association does not mean certainty.
Potential concerns include:
- Pain from degeneration. A fibroid may outgrow its blood supply, producing intense localized pain. Fever, nausea, or tenderness should be assessed.
- Placental complications. A nearby fibroid may be associated with bleeding or separation. Location is more informative than the diagnosis alone.
- Preterm contractions or birth. Reduced space or uterine irritation may contribute. The obstetric team interprets symptoms using gestational age and cervical findings.
- A breech or unusual fetal position. A large lower fibroid may limit the baby’s movement. Presentation is checked later in pregnancy.
- Cesarean birth or postpartum bleeding. A fibroid may obstruct delivery or affect uterine contractions. Vaginal birth remains possible when no barrier exists.
Individualized gynecologic evaluation matters more than alarming generalizations online.
How Are Fibroids Monitored During Pregnancy?
Ultrasound locates fibroids, shows their relationship to the placenta and cervix, evaluates fetal development, and investigates symptoms. Not every small fibroid requires extra scans; frequency depends on clinical findings.
Your obstetric clinician may pay particular attention to:
- Size and location. Measurements provide a baseline, but small differences may reflect scanning technique. Significance matters more than one number.
- Placenta and fetal growth. Monitoring may increase when a large fibroid could affect function or space. Complete ultrasound findings guide recommendations.
- The cervix and lower uterus. A nearby fibroid may affect delivery planning. Later position can matter more than an early measurement.
- New symptoms. Pain, bleeding, pressure, or contractions may prompt reassessment. Do not wait for a routine scan when symptoms feel urgent.
Managing Fibroid Pain Safely During Pregnancy
Fibroid pain may feel like an ache, pressure, or sudden tenderness. Similar symptoms can occur with miscarriage, preterm labor, placental problems, infection, or other urgent conditions.
Do not use pain medicine without guidance from the obstetric clinician who knows your gestational age and history. Rest, hydration, appropriate medication, or observation may help after the cause is assessed.
Seek urgent pregnancy care for:
- Heavy bleeding or dizziness. This may indicate substantial blood loss or a pregnancy complication. Emergency assessment is safer than blaming the fibroid.
- Severe or worsening pain. Degeneration is only one possibility. Sudden one-sided pain, faintness, or marked tenderness needs prompt attention.
- Contractions, fluid leakage, or early pelvic pressure. These may signal preterm labor. Contact the obstetric team immediately.
- Fever, chills, vomiting, or feeling very unwell. Infection or another condition may need treatment. Home remedies alone are not enough.
- Reduced fetal movement once a pattern is established. Follow the obstetric team’s instructions. A fibroid does not explain away a meaningful change.
Do Fibroids Change the Delivery Plan?
Fibroids do not automatically require cesarean birth. Vaginal delivery may remain appropriate when labor progresses and no growth blocks the cervix or lower uterus. Large, numerous, or low fibroids require individualized planning.
Removal during cesarean is not routine because increased uterine blood flow raises bleeding risk. Most definitive procedures are considered after recovery.
After delivery, fibroids often shrink. Symptoms and imaging should be reassessed before minimally invasive fibroid surgery because postpartum anatomy may change the plan.
Planning Care Before or After Pregnancy
Most people with fibroids can have a healthy pregnancy. Location, cavity distortion, symptoms, history, and current findings—not the diagnosis alone—define risk.
Hackensack CMIGS treats gynecologic conditions but does not provide pregnancy confirmation or prenatal care. For current symptoms, contact your obstetric clinician or emergency service. For fibroid treatment before a future pregnancy or after delivery, learn about Dr. Adam Shoman and request a surgical consultation. Individualized planning can prevent unnecessary fear and intervention.
Frequently Asked Questions
Do fibroids always grow during pregnancy?
No. Some grow, often earlier in pregnancy, while many remain stable or later shrink. Changes vary and do not necessarily predict a complication.
Can a small fibroid cause miscarriage?
Most small fibroids do not cause miscarriage. Location and cavity distortion may be more important than size alone, and other causes should also be considered.
Which type of fibroid is most concerning for miscarriage?
Submucosal or cavity-distorting fibroids may be more relevant because they alter the implantation space. Individual imaging and pregnancy history are necessary for interpretation.
What does fibroid degeneration feel like during pregnancy?
It may cause localized, sometimes severe abdominal pain and tenderness. Because other pregnancy complications feel similar, new or intense pain requires assessment.
Can fibroids harm the baby?
Most babies are not directly harmed by fibroids. Large or strategically located growths may influence fetal position, available space, placental function, or delivery planning.
Can fibroids cause bleeding during pregnancy?
They may be associated with bleeding, but pregnancy bleeding has many possible causes. Contact your obstetric clinician rather than assuming the fibroid is responsible.
Can fibroids cause preterm labor?
Fibroids are associated with increased preterm-birth risk in some pregnancies. The individual likelihood depends on fibroid characteristics and other maternal or obstetric factors.
Is a cesarean required if I have fibroids?
Not automatically. Cesarean delivery may be recommended if a fibroid blocks the birth pathway, the baby is malpositioned, or another obstetric indication develops.
Can fibroids be removed while pregnant?
Myomectomy during pregnancy is uncommon because the uterus has increased blood flow and surgery can cause serious bleeding. Treatment is usually deferred when safely possible.
Do fibroids shrink after giving birth?
Many shrink as the uterus recovers and pregnancy hormone levels fall. Postpartum reassessment helps determine whether symptoms remain and treatment is still necessary.
Disclaimer
This content is for educational purposes only and does not replace professional medical advice. Consult qualified healthcare professionals, as diagnosis and treatment recommendations vary according to individual circumstances.
