Blocked Fallopian Tubes: What Causes Them and What Can Be Done
Key Takeaways
A blocked fallopian tube usually causes no symptoms, so it is rarely noticed. It is usually found on an HSG, an X-ray test with dye. Whether it can be opened depends on where the blockage is and how damaged the tube is. When both tubes are significantly damaged, IVF is often the more direct route.
Key evidence: ASRM - role of tubal surgery in the ART era (2021) Swart et al. - accuracy of HSG in tubal pathology, meta-analysis ASRM - fertility evaluation of infertile women (2021)
On this page
- What a blocked fallopian tube actually means
- How would you know?
- What causes tubes to block
- Can a blocked tube be opened?
- Surgery, or straight to IVF?
- Dr. Aksoy’s Approach
- When the blocked tube is full of fluid
- Does fluid in a tube mean cancer?
- Frequently Asked Questions for Dr. Aksoy
- Sources
What a blocked fallopian tube actually means
At ovulation, the fallopian tube picks up the egg. Egg and sperm usually meet there. The tube then carries the early embryo towards the womb. A blockage breaks this path.
Where the blockage sits matters more than the word “blocked” suggests:
| Type | Where it sits | What it usually means |
|---|---|---|
| Proximal | At the point the tube joins the uterus | May reflect true obstruction or temporary spasm; repeat testing may clarify |
| Distal | At the far, fringed end near the ovary | More often genuine damage; may trap fluid inside the tube |
| Unilateral | One tube only | Natural conception often still possible through the other side |
| Bilateral | Both tubes | If complete blockage is confirmed, natural conception is not expected unless patency is restored; IVF bypasses the tubes |
A blockage seen only near the womb is less conclusive than one at the far end, and one blocked tube is very different from two.
How would you know?
You probably would not know. Blocked tubes usually cause no symptoms. No pattern of pain, bleeding, discharge or sensation reliably shows that a tube has closed.
Most women find out during a fertility assessment, even though they feel entirely well. A previous pelvic infection, operation or ectopic pregnancy may raise suspicion, but some women have no such history.
There is no home test to show whether a tube is open. This needs imaging. The usual test is a hysterosalpingogram (HSG), an X-ray that tracks dye through the tubes. HSG is useful for ruling in a blockage. It is not reliable for confirming that a tube is open.[1]
Evidence box: how accurate HSG is
A meta-analysis of 20 studies included 4,179 women with infertility. It compared HSG with laparoscopy and dye, the reference method. In the studies that assessed both tests independently, HSG’s sensitivity for tubal patency (correctly showing an open tube) was about 0.65. Its specificity was about 0.83. The authors concluded that HSG is of limited use for detecting an open tube, but its high specificity makes it useful for ruling in tubal obstruction.[1]
Keyhole surgery is not used only to check the tubes. If it is already planned for another reason, a dye test during the procedure can show where a tube is blocked.[3]
Pelvic pain, fever, unusual discharge or pain during sex deserve medical attention because they may indicate active infection or another condition. They do not reliably identify a blocked tube.
What causes tubes to block
Most tubal damage comes from scars left by an earlier infection, surgery or endometriosis. The tube may look intact but still not work well.
Previous pelvic infection is a common cause. Chlamydia is an important part of that risk. A Dutch study followed 5,704 women for up to eight years after chlamydia testing.[4] Tubal infertility occurred at 1.3 per 1,000 person-years after a positive test, compared with 0.2 per 1,000 after a negative test. Pelvic infection followed the same pattern: 4.4 versus 1.4 per 1,000 person-years.
The relative difference was substantial, but the absolute rates stayed low. Most women who have had chlamydia do not develop tubal infertility. Among chlamydia-positive women, a first infection before age 20 carried a higher risk of later tubal factor infertility than one at age 25 or older.[4]
Other recognised causes:
- Endometriosis, which can distort the anatomy around the tubes and ovaries
- Adhesions after abdominal or pelvic surgery, including appendicectomy and caesarean section
- A previous ectopic pregnancy, or surgery performed to treat one
- Previous tubal surgery, including sterilisation
- Fibroids sitting where the tube enters the uterus
Sometimes no obvious cause appears in the history, but the blockage can still be genuine.
Can a blocked tube be opened?
Sometimes. The answer depends mainly on where the blockage is and how much healthy tube remains.
For a proximal blockage, the doctor may repeat the scan or try selective cannulation before surgery. During cannulation, a fine tube is guided into the fallopian tube. This can tell a brief spasm or debris apart from a fixed block.[2]
For a distal blockage, surgery to open the fringed end may help in selected cases. Results are better when the tube wall is thin, its lining is still healthy and there is little scar tissue around it. A thick, swollen or firmly stuck tube is less likely to work well, and it may close again.[2]
Herbs, fertility massage and castor oil packs are often promoted online. They should not delay a scan. A reported blockage must first be confirmed, and the doctor needs to see where it is.
Surgery, or straight to IVF?
The next decision is whether repair or IVF offers the more suitable route.
IVF bypasses the tubes: eggs are collected directly from the ovaries and an embryo is placed into the uterus. It is often the more direct route when both tubes have confirmed, significant obstruction or damage.[2]
Surgery may still be reasonable in a narrower, clearly defined group. Age and ovarian reserve help decide how much time can reasonably be given to surgery and to trying naturally afterwards.[2] In this decision, the goal is a live birth: a baby born alive, not only a positive pregnancy test.
Sometimes surgery comes before IVF rather than replacing it. A fluid-filled tube may need treatment before embryo transfer.[2]
Dr. Aksoy’s Approach
The location of a blockage is only part of the decision. I also consider whether the tube is likely to function after it has been opened.
The site of the block determines which procedure is possible. The state of the tube helps predict whether it may work. Age and egg reserve show how much time can be given to surgery and trying naturally.
I therefore consider surgery in a narrow set of cases. In a younger patient with good reserve and no sperm problem, I would first treat a short proximal blockage with selective cannulation.
At the far end, I consider repair only when there is little, fine scar tissue. The fimbriae, or finger-like ends, must still be present. The tube wall should be thin and soft, with healthy folds inside. If a block near the womb affects one side only, no treatment may be needed when the other tube is normal.
I usually favour IVF when age is a concern or egg reserve is low. The same applies when there is a major sperm problem, damage at both ends of the tube, dense scars or a large hydrosalpinx.
A surgeon may be able to open a thick, scarred tube even when much of its lining and fringed end are lost. But making a channel does not make the tube work again. It may still fail to collect the egg or carry an embryo. It can also close again, and ectopic pregnancy remains a key risk.[2]
A hydrosalpinx that communicates with the uterus also reduces IVF pregnancy rates. Rather than trying to reopen a poor-prognosis tube, I remove it or close it at the uterine end before embryo transfer.[2]
My decision therefore rests on a more useful question: would opening the tube offer this patient a realistic and timely chance of live birth compared with IVF?
This clinical approach was recorded on 18 August 2026 and reviewed against ASRM guidance on the role of tubal surgery in the ART era.[2]
When the blocked tube is full of fluid
A distal blockage can trap fluid inside the tube, which then swells. This is a hydrosalpinx. Unlike a simple obstruction that IVF can bypass, a communicating hydrosalpinx can reduce IVF pregnancy rates.[2]
Several mechanisms have been proposed. One is fluid leaking from the tube into the womb, but how much each one contributes is unclear. ASRM advises considering removal or closure of the tube before IVF when the hydrosalpinx connects with the womb.[2] If your report mentions a swollen tube, fluid near the ovary, or dye that did not spill out of the tube, the linked article explains what this may mean.
If a previous infection is the cause, the article on salpingitis explains how inflammation damages the tube.
Does fluid in a tube mean cancer?
A fluid-filled tube does not by itself mean cancer.
Hydrosalpinx can follow pelvic infection, endometriosis or another cause that closes the far end of the tube. A tumour is one of the possible causes, so the doctor reads the whole scan, along with your age and symptoms.[5]
On an MRI with contrast, a solid area that takes up contrast inside a swollen tube needs a closer look (Kim et al., 2009).[5]
Frequently Asked Questions for Dr. Aksoy
Can a blocked tube be opened without surgery?
Yes, in some situations, but it depends on where the blockage is.
When a tube seems blocked near the womb, we can sometimes use a small catheter, guided under X-ray, to restore the passage. This technique does not require an abdominal operation.
Before proposing treatment, however, I check that the tube is really blocked. During a hysterosalpingogram, a passing spasm of the tube or a plug of mucus can give a false impression of obstruction.
When a tube is damaged at its far end, particularly with a hydrosalpinx, the situation is different. A catheter is generally not enough to repair the damage. Surgery or IVF then needs to be discussed, depending on the case.
I stress above all that an open tube is not necessarily a tube that works normally. It must also be able to catch the egg and carry it.
That is why I do not try to open a tube at any cost. My aim is to choose the option that gives the best chance of pregnancy.
What are the symptoms of a blocked fallopian tube?
Most often, a blocked tube causes no particular symptoms. Many women have regular periods, feel no pain and discover the problem during an infertility assessment.
In some situations, particularly when there is a hydrosalpinx, pelvic pain can appear. But this pain does not always occur.
It is also important to distinguish the symptoms of the blockage from those of the disease that caused it. For example, endometriosis or a pelvic infection can cause pain that is not directly caused by the blocked tube.
So I cannot tell whether a tube is open or closed from symptoms alone. To check, we usually use a hysterosalpingogram or an ultrasound with contrast medium.
Does a blocked tube affect periods?
No, a blocked tube generally does not change how often periods occur or how heavy they are.
This is a question my patients often ask me. Some believe that menstrual blood must pass through the tubes and that a blockage could stop it from leaving.
In reality, periods come from the lining of the uterus. The blood flows directly through the cervix and then through the vagina. The tubes are not needed for this process.
A woman can therefore have both tubes blocked and still have perfectly regular periods. This does not mean that she can conceive naturally, however.
If periods become very painful, very heavy or irregular, I look for another explanation, in particular endometriosis, adenomyosis or a hormonal disorder.
Normal periods do not guarantee that the tubes are open. And painful periods do not prove that they are blocked.
What causes blocked fallopian tubes?
The most frequent causes are past pelvic infections, in particular certain chlamydia infections, which can damage the tubes even when they have gone almost unnoticed.
Endometriosis can also cause adhesions around the tubes and disrupt how they work.
Other situations may be involved: a previous ectopic pregnancy, surgery in the pelvis or abdomen, or earlier inflammatory damage.
A hysterosalpingogram can also show a blocked tube when the cause is simply a temporary spasm at the time of the examination.
In my practice, I mainly try to work out whether the tube is simply obstructed or truly damaged.
This distinction changes the treatment. A small blockage near the womb can sometimes be corrected, while a dilated tube full of fluid, with a damaged lining, may remain non-functional even if we manage to open it.
Can you get pregnant with a blocked tube?
Yes. If only one tube is blocked and the other is open and working normally, a natural pregnancy remains entirely possible.
I do look at several factors, however: the woman’s age, the quality of ovulation, the state of the remaining tube and the results of the semen analysis.
It is also worth knowing that the ovary and the tube do not always work exclusively on the same side. A functional tube can sometimes catch an egg released by the opposite ovary.
By contrast, when both tubes are completely blocked, a natural pregnancy is only possible in exceptional cases. IVF then bypasses the tubes, since fertilisation takes place in the laboratory.
One situation deserves particular attention: hydrosalpinx. Even when only one tube is affected, the fluid it contains can reduce the chances of implantation during IVF. It may therefore be necessary to treat that tube before embryo transfer.
Finally, a damaged tube can increase the risk of ectopic pregnancy. When a pregnancy begins, I therefore recommend early monitoring to confirm that it is developing in the uterus.
One functional tube may be enough to achieve a pregnancy. What matters is not only the number of open tubes, but how they actually work and the full fertility assessment.
Sources
- Swart P, Mol BW, van der Veen F, van Beurden M, Redekop WK, Bossuyt PM. The accuracy of hysterosalpingography in the diagnosis of tubal pathology: a meta-analysis. Fertil Steril. 1995;64(3):486–491. PubMed · doi:10.1016/S0015-0282(16)57781-4
- ASRM Practice Committee. Role of tubal surgery in the era of assisted reproductive technology: a committee opinion (2021). ASRM, tubal surgery (2021)
- ASRM Practice Committee. Fertility evaluation of infertile women: a committee opinion (2021). ASRM, fertility evaluation (2021)
- Hoenderboom BM, van Benthem BHB, van Bergen JEAM, et al. Relation between chlamydia trachomatis infection and pelvic inflammatory disease, ectopic pregnancy and tubal factor infertility in a Dutch cohort of women previously tested for chlamydia in a chlamydia screening trial. Sex Transm Infect. 2019;95(4):300–306. PubMed · doi:10.1136/sextrans-2018-053778
- Kim MY, Rha SE, Oh SN, et al. MR imaging findings of hydrosalpinx: a comprehensive review. Radiographics. 2009;29(2):495–507. PubMed · doi:10.1148/rg.292085070
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The content has been created by Dr. Senai Aksoy and medically approved.