Bicornuate Uterus: A Comprehensive Guide on Causes, Symptoms and Treatment Options

TL;DR

A bicornuate uterus, or "heart-shaped womb," is a uterus that is partly divided into two "horns" instead of being a single pear-shaped cavity. It is a congenital condition (present from birth) that forms when the uterus does not fully fuse during early development, and it affects roughly 0.4% of women, about 1 in 200 (StatPearls / NCBI). It usually causes no symptoms, so many women only discover it during pregnancy or a scan. Importantly, it does NOT usually reduce your ability to get pregnant, but it can raise the risk of miscarriage, preterm birth and the baby lying in an awkward position (Tommy's). Most women with a bicornuate uterus have healthy pregnancies with close monitoring. Surgery is rarely needed and is reserved for specific cases. It is different from a septate uterus, which is managed differently, so accurate diagnosis matters.

Quick Answer

A bicornuate uterus is a heart-shaped womb, partly split into two horns, that a woman is born with. It affects about 0.4% of women and often causes no symptoms. It usually does not affect the ability to conceive, but it can increase the risk of miscarriage, preterm birth and breech position, so pregnancy is monitored more closely. Most women have successful pregnancies. Surgery is rarely needed. It must be told apart from a septate uterus, which is treated differently, so a proper scan (often MRI or 3D ultrasound) is important.

Author: Mylo Editorial Team, Mylo Parenting Desk Medically reviewed by: Mylo Editorial Board, aligned with ACOG and FOGSI guidance Last updated: 7 July 2026

Medical Disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice. A bicornuate uterus is diagnosed and managed by a gynaecologist. If you have this condition and are pregnant or planning pregnancy, discuss a personalised plan with your doctor, and report any bleeding, pain or contractions promptly.

Key Takeaways

• A bicornuate uterus is a congenital "heart-shaped" womb, partly divided into two horns (StatPearls / NCBI)
• It affects roughly 0.4% of women (about 1 in 200) and is often symptomless
• It usually does NOT reduce your ability to conceive (Tommy's)
• It can raise the risk of miscarriage, preterm birth, and the baby lying breech
• Pregnancy is treated as higher-risk and monitored more closely, and most women have healthy babies
• It is often found by chance on a scan or during pregnancy
• It must be distinguished from a septate uterus, which is managed very differently (StatPearls / NCBI)
• Surgery is rarely needed and is reserved for selected cases, such as repeated pregnancy loss

What Is a Bicornuate Uterus?

A typical uterus is a single, pear-shaped cavity. In a bicornuate uterus, the top of the womb has a deep dip inward, so the cavity is partly divided into two connected "horns," giving it a heart shape (StatPearls / NCBI).

It happens because of how the uterus forms before birth. In early fetal development, the uterus grows from two tubes (the Müllerian ducts) that normally fuse into one cavity. If they do not fully fuse, the result is a partly divided, heart-shaped uterus. The exact reason this happens is not fully understood, and there may be a genetic link. It is something a woman is born with, not caused by anything she or her parents did.

What Causes a Bicornuate Uterus?

It is a congenital condition that develops in the womb, not something acquired later. During early development, the two Müllerian ducts fail to fuse completely, leaving the uterus partly divided (StatPearls / NCBI). The precise cause is unclear, and research suggests genetics may play a part. Nothing in a woman's lifestyle causes it.

What Are the Types of Bicornuate Uterus?

It is classified by whether the division extends to the cervix (the neck of the womb) (StatPearls / NCBI):

Both are variations of the same condition. The type is identified on imaging and helps the doctor plan care, but pregnancy is monitored closely in either case.

Bicornuate Uterus vs Septate Uterus: Why the Difference Matters

A bicornuate uterus is often confused with a septate uterus, but they are different conditions with different treatments (StatPearls / NCBI):

• Bicornuate uterus: the outer shape of the womb is genuinely divided (a fusion problem). It is usually NOT corrected with surgery.
• Septate uterus: the outer shape is normal, but a band of tissue (a septum) divides the inside. This CAN often be corrected with a minor procedure.

Because the management is so different, an accurate diagnosis, usually with MRI or 3D ultrasound, is essential before any treatment decision.

What Are the Symptoms of a Bicornuate Uterus?

Many women have no symptoms at all and never know they have it unless a scan reveals it. When symptoms do occur, they may include (StatPearls / NCBI) (Tommy's):

• Period pain or cramping
• Heavy or irregular periods
• Pain during intercourse
• Pelvic pain or discomfort
• Repeated miscarriage or preterm labour (often the first clue that leads to diagnosis)

Note: a bicornuate uterus does NOT usually cause difficulty getting pregnant. If you are having trouble conceiving, there is often another reason that a doctor can look into.

How Is a Bicornuate Uterus Diagnosed?

It is usually found through imaging that shows the shape of the uterus (StatPearls / NCBI):

• Ultrasound (including 3D transvaginal ultrasound), often the first test
• MRI, which gives a detailed picture and helps tell a bicornuate uterus apart from a septate uterus
• Hysteroscopy or other specialist tests in some cases

Seeing the external contour of the uterus (the heart-shaped dip at the top) is what distinguishes a bicornuate uterus from other conditions, which is why 3D ultrasound or MRI is preferred.

How Does a Bicornuate Uterus Affect Pregnancy?

Most women with a bicornuate uterus can and do have healthy babies, but the pregnancy is considered higher-risk and watched more closely. Possible complications include (StatPearls / NCBI) (Tommy's):

With good antenatal care, many of these risks are managed, and the majority of women go on to have a successful birth.

How Is Pregnancy with a Bicornuate Uterus Managed?

If you are pregnant and have a bicornuate uterus, your care team will treat it as higher-risk and put a plan in place (Tommy's):

• Attend all antenatal appointments and extra growth scans so any issue is caught early
• Watch the baby's position later in pregnancy, and discuss delivery options (vaginal birth or caesarean)
• Report any bleeding, pelvic pain, or regular tightening/contractions to your doctor promptly, because of the higher preterm risk
• Follow any medication your doctor prescribes (for example, if you develop signs of preterm labour)
• Make a delivery plan in advance with your obstetrician
• Take your usual pregnancy supplements and look after your general health

What Are the Treatment Options?

Most women with a bicornuate uterus need NO surgery, only close monitoring during pregnancy (StatPearls / NCBI). Treatment is considered only in specific situations:

The right choice depends on your situation, symptoms and pregnancy history. A gynaecologist will recommend the most appropriate plan, and for most women that is simply careful monitoring, not surgery.

Indian Context: What Indian Women Should Know

• Often found during pregnancy: Many Indian women first learn they have a bicornuate uterus during a routine pregnancy scan; this is common and not a cause for panic
• Fertility reassurance: It usually does not stop you from conceiving; if there is difficulty getting pregnant, ask your doctor to check for other causes
• Choose the right imaging: A 3D ultrasound or MRI is more accurate than a basic scan for telling a bicornuate uterus from a septate uterus, ask your gynaecologist
• Do not rush into surgery: Surgery is rarely needed; be cautious of any advice to operate without a clear reason such as repeated pregnancy loss
• High-risk care is available: Maternal-fetal medicine specialists and high-risk pregnancy care are available in many Indian hospitals; ask for a referral if needed
• Keep every appointment: Regular antenatal visits and growth scans are the single most helpful step for a good outcome

Myths vs Facts About Bicornuate Uterus

FAQs: Bicornuate Uterus

Can I get pregnant with a bicornuate uterus?

Yes. A bicornuate uterus usually does not reduce your ability to conceive. The main concern is a higher risk of pregnancy complications like miscarriage and preterm birth, which is why pregnancy is monitored more closely (Tommy's).

Bicornuate uterus mein normal delivery ho sakti hai? (Hinglish)

Ho sakti hai, lekin ye baby ki position par depend karta hai. Bicornuate uterus mein baby aksar breech (ulti) position mein aa sakta hai, jiske liye C-section ki zaroorat pad sakti hai (StatPearls / NCBI). Agar baby head-down position mein hai aur koi complication nahi hai, toh normal delivery bhi possible hai. Aapke doctor delivery ke waqt best plan batayenge. Regular scans aur check-ups zaroor karayein.

Is a bicornuate uterus dangerous?

It is not dangerous in daily life, and many women never have any problems. In pregnancy it raises certain risks (miscarriage, preterm birth, breech position), so the pregnancy is treated as higher-risk and monitored closely. With good care, most women have healthy babies (Tommy's).

Does a bicornuate uterus always need surgery?

No. Most women need only close monitoring, not surgery. Surgery (Strassman metroplasty) is rare and considered only for selected women with repeated pregnancy loss after other causes are ruled out (StatPearls / NCBI).

Bicornuate uterus aur septate uterus mein kya farak hai? (Hinglish)

Dono alag conditions hain. Bicornuate uterus mein uterus ki bahar ki shape hi do hisson mein bati hoti hai (fusion ki problem), aur ise aksar surgery se theek nahi kiya jata. Septate uterus mein bahar ki shape normal hoti hai lekin andar ek septum (tissue ki deewar) hoti hai, jise ek chhoti procedure se hata sakte hain (StatPearls / NCBI). Isliye MRI ya 3D ultrasound se sahi diagnosis zaroori hai, kyunki dono ka ilaaj alag hai.

How is a bicornuate uterus diagnosed?

Through imaging, usually an ultrasound first, and often a 3D ultrasound or MRI to see the shape of the uterus clearly and tell it apart from a septate uterus. Hysteroscopy is used in some cases (StatPearls / NCBI).

Will I need extra scans during pregnancy?

Usually yes. Because a bicornuate uterus pregnancy is higher-risk, your doctor will typically arrange extra growth scans and closer monitoring, and will check the baby's position later in pregnancy (Tommy's).

Can a bicornuate uterus cause miscarriage?

It can raise the risk of miscarriage, particularly later in pregnancy, and of preterm birth. However, many women with the condition carry to term successfully with close antenatal care. If you have had repeated losses, your doctor will investigate and discuss options (StatPearls / NCBI).

References

1. Kaur P, Panneerselvam D. "Bicornuate Uterus." StatPearls, NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK560859/
2. Tommy's. "Congenital Uterine Abnormality (Problems With the Womb)." https://www.tommys.org/pregnancy-information/pregnancy-complications/uterine-abnormality-problems-womb
3. FOGSI (Federation of Obstetric and Gynaecological Societies of India). https://www.fogsi.org/