Blocked Fallopian Tubes: What It Means for Conceiving

What the tubes do, and why blockage matters

The fallopian tubes are not passive pipes. They collect the egg after ovulation, are where fertilisation normally happens, and transport the developing embryo to the uterus. If a tube is blocked or damaged, that sequence cannot complete, which is why tubal problems are one of the larger categories in any fertility work-up.

NICE Clinical Knowledge Summaries give the UK distribution: male factors in about 30% of couples, ovulatory disorders in about 25%, tubal damage in about 20%, uterine or peritoneal disorders in about 10%, and no identifiable cause in about 25%, with problems in both partners in about 40%.

What causes it

The most common cause of tubal factor infertility is pelvic inflammatory disease and acute salpingitis, though NICE Clinical Knowledge Summaries note that all pelvic infections, including appendicitis and diverticulitis, can damage the tubes. Chlamydia trachomatis, Neisseria gonorrhoeae and anaerobic organisms are the most common infecting organisms.

The dose-response relationship is stark and worth knowing: the incidence of tubal damage is about 10–12% after one episode of pelvic infection, 23–35% after two, and 54–75% after three. The risk of ectopic pregnancy can increase sixfold to sevenfold after an episode of pelvic inflammatory disease.

Other causes include endometriosis, which can obstruct the tubes anatomically and is present in 25–40% of women with infertility compared with 0.5–5% of fertile women; previous tubal surgery or sterilisation; and congenital differences. Many people with tubal damage had an infection they never knew about, because chlamydia frequently causes no symptoms. That is a reason for screening, not for self-reproach.

How it is diagnosed

NICE recommends hysterosalpingography — an X-ray with dye, usually called an HSG — to screen for tubal occlusion in people with no known comorbidities, because it is reliable for ruling out blockage and is less invasive than the alternative. Where there are relevant comorbidities such as pelvic inflammatory disease, previous ectopic pregnancy or endometriosis, laparoscopy and dye is recommended instead, because it allows tubal and other pelvic pathology to be assessed and treated at the same time.

NICE also recommends screening for chlamydia before any instrumentation of the uterus. Hysteroscopy can be used to look inside the uterine cavity for fibroids, adhesions or a septum. The HFEA notes that a laparoscopy and dye test inspects the whole pelvis, confirming whether the tubes are open and healthy and whether endometriosis or adhesions are present.

When surgery is offered

NG257 was updated in 2026 and its tubal recommendations are specific about which situation gets which treatment.

Mild tubal disease

NICE says to consider tubal surgery as a treatment option for mild tubal disease, in centres where appropriate expertise is available. That last clause is not decorative: this is specialist reconstructive work and outcomes depend on the surgeon.

Blockage near the uterus

For subfertility due to proximal tubal obstruction, NICE says to consider fallopian tube catheterisation by hysteroscopic or radiological guidance, after discussing the risks and benefits of other options including IVF.

Hydrosalpinx before IVF

This is the recommendation people are most often surprised by. A hydrosalpinx is a tube blocked at its outer end and distended with fluid. NICE recommends offering laparoscopic salpingectomy — removing the tube — or tubal occlusion to treat hydrosalpinges before IVF. Where there is a high risk of complications from laparoscopic surgery, NICE says to consider aspiration close to the time of egg collection.

The HFEA explains the reasoning in plain terms: where damage is too severe to repair, doctors may recommend removing the tube, because this has been shown to improve the chance of successful IVF treatment. Removing a tube sounds like a reduction in fertility, and in IVF it is the opposite — the fluid itself appears to interfere with implantation.

NICE also recommends hysteroscopic adhesiolysis where intrauterine adhesions are found in someone with absent periods, because it is likely to restore menstruation and improve the chance of pregnancy.

After tubal surgery

The HFEA sets out the usual expectation: people with tubal damage should try naturally for up to six months after surgery, and there is a higher risk of ectopic pregnancy, so a scan at around six weeks is needed if you conceive, to confirm the pregnancy is in the uterus. If conception has not happened six months after surgery, the next step is usually IVF.

That ectopic risk is the reason to have a plan rather than to wait and see. If you conceive after tubal surgery and develop one-sided tummy pain, shoulder-tip pain, or bleeding with faintness, seek urgent medical help.

Where the diagnosis sits in the wider picture

Tubal problems rarely arrive alone in a fertility work-up, and NICE's investigation set is designed to find the others at the same time. A semen analysis for a male partner is a single non-invasive test, and NICE Clinical Knowledge Summaries put uterine or peritoneal disorders at about 10% of couples, with uterine abnormalities such as adhesions, polyps, submucous fibroids and septae found in 10–15% of women seeking fertility treatment. Fibroids may be the sole cause of infertility in 2–3% of women, depending on where in the uterus they sit.

Making the decision

Surgery and IVF are not competing philosophies; they suit different situations. The factors that shape the choice are the extent and site of the damage, your age and ovarian reserve, whether there is a male factor, how long you have been trying, and the expertise available locally. NICE recommends taking ovarian reserve into account when discussing IVF, and using AMH or antral follicle count to inform counselling about the likelihood of live birth after assisted conception — while explicitly advising against using AMH to predict natural conception.

Two questions are worth asking directly at your appointment: is the damage mild, proximal, or a hydrosalpinx, because the recommended treatment differs for each; and does this centre have the specific expertise for the operation being proposed?