Blocked Fallopian Tubes

Blocked fallopian tubes, also called tubal factor infertility, mean one or both tubes are obstructed so the egg and sperm cannot meet and a fertilised egg cannot reach the womb. It is a major cause of female infertility. One review notes that women with blocked tubes and hydrosalpinx make up 30% to 40% of the whole infertile population (Ambildhuke, 2022).

The fallopian tubes are not just passive pipes. They pick up the egg, provide the place where fertilisation happens, and gently move the early embryo to the uterus. When a tube is scarred or blocked, that whole process stalls. A tube can be blocked at the womb end (proximal), at the ovary end (distal), or along its length, and one or both tubes may be affected.

Most tubal blockage comes from past infection and the scarring it leaves behind. Pelvic inflammatory disease (PID), often caused by sexually transmitted infections such as chlamydia and gonorrhoea, is a leading cause worldwide. In a large Dutch cohort, women who had tested positive for chlamydia developed tubal factor infertility at 1.3 per 1,000 person-years versus 0.2 in those who tested negative (Hoenderboom, 2019).

In India, genital tuberculosis is a major and often overlooked cause. A North India study of women seeking assisted conception found genital TB in 48.5% of tubal factor cases (Singh, 2008). A meta-analysis of 42 studies put the pooled prevalence of female genital TB among infertile women at 20%, and the fallopian tube is affected in about 90% of cases (Ahmed, 2022). Other causes include endometriosis, previous pelvic or tubal surgery, a ruptured appendix, and a prior ectopic pregnancy.

Blocked fallopian tubes are usually silent. Most women have regular periods, ovulate normally, and feel completely well, so difficulty conceiving is often the first and only sign. This is why tubal disease is frequently missed until a fertility check-up.

When symptoms do appear, they reflect the underlying cause rather than the blockage itself. A history of pelvic infection, pelvic pain, unusual vaginal discharge, or painful periods can be clues. A hydrosalpinx, a tube swollen with fluid, can sometimes cause a dull ache on one side or watery discharge. Genital TB may show up only as subtle signs such as scanty periods or unexplained tubal damage, which is part of why it is easy to overlook in India.

Hysterosalpingography (HSG), an X-ray taken while dye is passed through the womb and tubes, is the usual first-line test for tubal patency. It is widely available and affordable, but it is not perfect. A meta-analysis found HSG had about 65% sensitivity and 83% specificity against laparoscopy, so it is better at confirming a blockage than at ruling one out (Swart, 1995).

Laparoscopy with chromopertubation, where a surgeon watches dye spill from the tubes through a keyhole camera, remains the gold standard and can treat some problems in the same sitting. HyCoSy, an ultrasound version using a contrast medium instead of X-ray dye, is a radiation-free alternative. In India, because genital TB is common, doctors may add tests such as endometrial sampling for TB-PCR when the picture suggests it.

Standard Diagnostic Tests in India

• Hysterosalpingography (HSG) — First-line X-ray with dye to check tubal patency; about 65% sensitive and 83% specific, so better at confirming blockage than excluding it.
• Laparoscopy with chromopertubation — The gold standard: a keyhole camera watches dye spill from the tubes, and adhesions can be treated in the same sitting.
• HyCoSy — An ultrasound test using contrast instead of X-ray dye to assess tubal patency without radiation.
• TB testing — In India, endometrial sampling for TB-PCR, histology, or culture is added when genital tuberculosis is suspected.
• Pelvic ultrasound — Can reveal a hydrosalpinx as a fluid-filled tubular structure and assess the ovaries and womb.

The impact depends on how many tubes are blocked and where. If one tube is open and healthy, natural pregnancy is still possible, though it may take longer. When both tubes are completely blocked, sperm and egg cannot meet, so natural conception is not possible and IVF, which bypasses the tubes entirely, becomes the clear route.

A hydrosalpinx is a special problem. The trapped, often inflammatory fluid can leak back into the womb and harm an embryo trying to implant, which lowers IVF success. Damaged tubes also raise the risk of ectopic pregnancy, where an embryo lodges in the tube instead of the womb. This is why doctors look not only at whether tubes are open, but at their quality and any fluid inside them.

• Bilateral blockage stops conception: When both tubes are fully blocked, sperm and egg cannot meet, so natural pregnancy is not possible.
• One healthy tube still gives a chance: If a single tube is open and undamaged, natural conception can still happen, though it may take longer.
• Hydrosalpinx harms implantation: Trapped fluid can leak into the womb and damage an embryo, which lowers IVF success rates.
• Higher ectopic risk: Damaged tubes raise the chance of an embryo implanting in the tube rather than the womb.
• Genital TB scarring is often permanent: Tubes scarred by tuberculosis rarely regain function even after a full course of anti-TB treatment.

The two main routes are tubal surgery to repair or reopen the tubes, and IVF to bypass them. The right choice depends on age, the severity and site of the blockage, and whether there are other fertility factors. The WHO guideline suggests surgery rather than IVF for younger women (under 35) with mild to moderate disease, and IVF rather than surgery for severe disease or for women aged 35 and over (WHO, 2025).

Surgery can mean opening a blocked tube end, freeing adhesions, or rejoining a tube after sterilisation. A hydrosalpinx is handled differently: before IVF, the affected tube is usually removed (salpingectomy) or clipped, because draining is not enough. Where genital TB caused the damage, a full course of anti-TB treatment comes first, but tubes already scarred by TB rarely recover function, so IVF is often the realistic plan afterwards.

IVF is the most effective treatment for blocked tubes because it skips the tubes altogether: eggs are collected directly from the ovaries, fertilised in the laboratory, and the embryo is placed straight into the womb. For women with both tubes blocked, this is the main path to pregnancy.

One step matters before you start. If you have a hydrosalpinx, your doctor will usually advise removing or sealing that tube first. A Cochrane review found that salpingectomy before IVF increases the clinical pregnancy rate, with a risk ratio of 2.02 compared with no surgery (Melo, 2020). For women whose tubes were damaged by genital TB, IVF success also depends on the womb lining being healthy, so the uterus is assessed carefully before transfer.