What Is a Uterine Septum?
A uterine septum is a band of tissue that divides part or all of the inside of the uterus into two sections. It forms before birth, when the uterus does not fully join together the way it normally does. It is the most common congenital (present-from-birth) uterine anomaly, and many people never know they have one unless it shows up during a pregnancy scan or a fertility workup.
A septum is different from a normally shaped uterus with a small dip at the top, called an arcuate uterus. That difference matters, because the two conditions are managed differently.
Urgent Pregnancy Warning Signs
If you are pregnant and have any of the following, contact your healthcare provider right away or seek emergency care:
- Heavy vaginal bleeding or bleeding with clots
- Severe or worsening abdominal or pelvic pain
- Contractions before 37 weeks of pregnancy
- Fluid leaking from the vagina before your due date
- A noticeable decrease in your baby’s movements
- Fever, chills, or feeling seriously unwell
These signs are not specific to a uterine septum, but anyone with a known uterine anomaly should mention it to their care team so it can be considered as part of their evaluation.
How a Uterine Septum Is Diagnosed
A uterine septum is usually found during an evaluation for infertility, recurrent pregnancy loss, or an unrelated pelvic ultrasound. Common tools used to identify and confirm it include:
- Transvaginal ultrasound, often the first imaging test used
- 3D ultrasound, which gives a more detailed view of the uterine shape
- Magnetic resonance imaging (MRI), used when more detail is needed
- Hysterosalpingography (HSG), an X-ray procedure using dye that shows the shape of the uterine cavity
- Hysteroscopy, a procedure where a thin camera is passed into the uterus to directly view the inside
Because a septum can look similar to a normal variation called an arcuate uterus on some scans, more than one type of imaging is sometimes needed to confirm the diagnosis.
Septate Uterus vs. Arcuate Uterus: Quick Comparison
- Septate uterus: A band of tissue extends further into the uterine cavity; linked in research to higher rates of pregnancy loss and preterm birth; hysteroscopic surgery may be considered.
- Arcuate uterus: A mild, shallow dent at the top of the uterus; generally considered a normal variation; not usually linked to pregnancy complications; surgery is not typically recommended.
Only a qualified clinician using imaging can tell the two apart. This comparison is for general understanding only, not for self-diagnosis.
How a Uterine Septum Can Affect Pregnancy
Research on people with an untreated uterine septum has linked the condition to a higher chance of certain pregnancy complications, including:
- First-trimester miscarriage
- Recurrent pregnancy loss
- Preterm labor and delivery
- Abnormal fetal position (such as breech) later in pregnancy
Researchers believe these outcomes may relate to reduced blood flow in the septal tissue, which can make it a less supportive site for an embryo to implant and grow. It is important to know that many people with a uterine septum carry a pregnancy to term without any problems, and having a septum does not mean a pregnancy will end in loss.
When Is Hysteroscopic Septum Resection Recommended?
Hysteroscopic septum resection is a minimally invasive surgery where a surgeon removes the septum using instruments passed through a hysteroscope, without any external incisions. It is generally considered for people who have:
- A history of recurrent pregnancy loss
- Infertility with no other clear explanation, once a septum is confirmed
- A confirmed septate uterus on imaging, distinguished from a normal arcuate uterus
Surgery is not automatically recommended for everyone who has a septum. Many professional groups note that people without symptoms or a history of pregnancy loss may not need treatment at all. The decision is individualized and made with a reproductive specialist based on personal history, imaging findings, and pregnancy goals.
What the Outcomes Data Shows
Evidence on how much surgery helps is more mixed than many people expect. A systematic review and meta-analysis of studies on hysteroscopic septum resection in people with subfertility or prior poor pregnancy outcomes found that surgery was linked to a lower rate of miscarriage compared with no treatment. The same analysis did not find a significant difference in live birth rates, clinical pregnancy rates, or preterm delivery rates between those who had surgery and those who did not.
Professional guidance in this area describes surgical treatment of a uterine septum as a reasonable option to offer in cases of recurrent pregnancy loss, while also noting that the overall strength of the supporting evidence is limited. This is an active area of ongoing research, and recommendations may be refined as more data becomes available.
Evidence Limits
- Much of the research on septum surgery comes from smaller studies rather than large randomized trials.
- Results can vary depending on septum size, thickness, and a person’s individual reproductive history.
- Long-term comparisons between surgical and non-surgical management are still limited.
- This article summarizes general findings and is not a substitute for a personal evaluation.
Who May Need Extra Care in Evaluation
- People with a history of two or more pregnancy losses
- People with unexplained infertility
- People with other congenital reproductive tract differences, since these can occur alongside a septum
- People with a history of preterm birth or abnormal fetal positioning in a prior pregnancy
Anyone in these groups should discuss uterine imaging with a qualified healthcare provider or reproductive specialist.
Frequently Asked Questions
Can I still get pregnant naturally with a uterine septum?
Yes, many people with a uterine septum conceive without fertility treatment. A septum affects the shape of the uterine cavity, not typically ovulation or egg release, though it may raise the chance of certain pregnancy complications.
Is a uterine septum the same as fibroids?
No. A uterine septum is a congenital band of tissue present from birth. Fibroids are separate, usually non-cancerous growths that can develop later in life. They are different conditions with different causes and treatments.
Does every uterine septum need surgery?
No. Many people with a septum, especially without a history of pregnancy loss or infertility, are simply monitored. The decision to pursue surgery is individual and made with a specialist.
How is a uterine septum different from a bicornuate uterus?
Both are congenital uterine anomalies, but they form differently. A septate uterus has a normal outer shape with a dividing band inside, while a bicornuate uterus has two separate horn-shaped sections and a heart-shaped outer contour. Imaging is needed to tell them apart, since management can differ.
Educational Disclaimer
This article is for general educational purposes only and does not replace professional medical advice, diagnosis, or treatment. It is not intended to diagnose any individual’s condition, predict fertility outcomes, or recommend a specific treatment plan. Always talk with a qualified healthcare provider or reproductive specialist about your own symptoms, imaging results, and pregnancy history. For more on how we source and review our content, see our Editorial Policy and Medical Disclaimer. You can learn more about our team on the About page.