Medically reviewed by Dr. Shweta Agarwal, MBBS, DGO. Last updated: June 2026.
Information on this page is educational and does not replace a medical consultation. Outcomes depend on individual clinical factors.
What exactly are blocked fallopian tubes, and why do they cause infertility?
Each fallopian tube is a thin, muscular channel that connects an ovary to the uterus. After ovulation, the tube picks up the released egg, and it is inside the tube that sperm and egg usually meet and fertilise. The resulting embryo then travels down the tube to implant in the uterus. A blockage anywhere along this path disrupts the process in one of two ways:
- It prevents sperm and egg from meeting, so fertilisation cannot occur.
- It traps a fertilised embryo in the tube, which cannot reach the uterus — and can also raise the risk of an ectopic (tubal) pregnancy.
In Marathi and Hindi, blocked tubes are commonly described as बंद फॅलोपियन नलिका or नळी बंद — terms your doctor may use during consultation. A blockage can affect one tube (unilateral) or both (bilateral), and this distinction is central to deciding the right approach.
What causes blocked fallopian tubes?
The most common cause is scarring or adhesions following infection or inflammation in the pelvis. Causes include:
- Pelvic inflammatory disease (PID): Infection of the reproductive organs — often from sexually transmitted infections such as chlamydia or gonorrhoea — is a leading cause of tubal damage.
- Genital tuberculosis: In India, pelvic/genital TB is an important and sometimes silent cause of tubal blockage and infertility. It can damage tubes without obvious symptoms.
- Endometriosis: Endometrial-like tissue and the adhesions it creates can distort or block the tubes. See our endometriosis page.
- Previous pelvic or abdominal surgery: Operations on the tubes, ovaries, appendix, or for prior ectopic pregnancy can leave adhesions.
- History of ectopic pregnancy: A prior tubal pregnancy can damage the tube and increase the risk of future blockage.
- Hydrosalpinx: A specific condition in which a blocked tube fills with fluid, swelling and distending it. This both blocks the tube and — if the fluid leaks back into the uterus — can reduce the success of fertility treatment.
Does a blocked fallopian tube cause any symptoms?
Often, no. Many women with blocked tubes have no symptoms at all, and the blockage is discovered only during a fertility evaluation. This is why difficulty conceiving is frequently the first sign.
When symptoms do occur, they may include:
- Pelvic pain: Ranging from occasional discomfort to persistent lower abdominal pain, sometimes worse around menstruation.
- Symptoms of an underlying cause: Such as the painful periods of endometriosis or the symptoms of an active pelvic infection.
- Hydrosalpinx-related discomfort: A swollen, fluid-filled tube can cause a dull ache or, occasionally, unusual vaginal discharge.
Because reliable symptoms are usually absent, testing is the only way to confirm whether the tubes are open.
How are blocked fallopian tubes diagnosed?
Diagnosis is done in a stepwise way. Both core tests are available in-house at Aansh Hospital — see our fertility diagnostics page for the full assessment.
HSG (Hysterosalpingography) — the first-line test
An HSG is usually the first test for tubal patency. A contrast dye is introduced through the cervix and X-ray images track whether the dye flows freely through both tubes and spills into the pelvis. Free spill indicates open tubes; a blockage shows where the dye stops. HSG also gives information about the shape of the uterine cavity.
Diagnostic laparoscopy — confirmatory and therapeutic
A laparoscopy allows the surgeon to view the tubes, ovaries, and pelvis directly through a thin camera. Combined with a dye test (chromopertubation), it is the most accurate way to confirm tubal status. Crucially, laparoscopy is both diagnostic and therapeutic — in selected cases, adhesions can be released or a hydrosalpinx clipped or removed during the same procedure.
Other tubal assessments
Some clinics use sonosalpingography (an ultrasound-based tubal patency test). The choice of test is individualised by Dr. Shweta Agarwal based on your history and clinical picture.
Unilateral vs bilateral block — and the hydrosalpinx note
Whether one or both tubes are affected changes the outlook significantly:
| Situation | What it means |
|---|---|
| Unilateral block (one tube open) | Natural conception remains possible through the open tube, particularly if the ovary on that side ovulates normally. Evaluation focuses on optimising natural chances or assisting them. |
| Bilateral block (both tubes blocked) | Sperm and egg cannot meet through the tubes at all. Natural conception is not possible, and IVF — which bypasses the tubes entirely — is the main route to pregnancy. |
Hydrosalpinx is a special case. When a fluid-filled hydrosalpinx is present, the fluid can leak into the uterus and meaningfully reduce IVF success and increase miscarriage risk. For this reason, current practice is to surgically remove or clip the affected tube before IVF — this is well established to improve treatment outcomes. This is decided case by case with Dr. Shweta Agarwal.
What does a tubal block mean for fertility, and what are the options?
A tubal block does not mean pregnancy is out of reach — it changes the route. There are two broad approaches, and the right one depends on whether the block is unilateral or bilateral, the cause, the degree of damage, your age, and any other fertility factors.
Tubal surgery — helpful only in selected cases
Laparoscopic surgery to release adhesions or repair a tube can be appropriate when the blockage is mild, recent, or limited — for example, fine adhesions near the end of an otherwise healthy tube. Surgery is less likely to help when tubes are extensively scarred, when there is a large hydrosalpinx, or when the woman is older or time is a concern. Even after successful surgery, there is an increased risk of ectopic pregnancy because the repaired tube may not function perfectly.
IVF — the main route, because it bypasses the tubes entirely
IVF does not require the fallopian tubes at all. Eggs are collected directly from the ovaries, fertilised in the laboratory, and the resulting embryo is placed straight into the uterus — completely bypassing any blockage. This is why IVF is the principal treatment for bilateral tubal blockage and for most significant tubal damage. Our in-house embryology laboratory, led by Aayush Agarwal, Ph.D., handles fertilisation and embryo culture.
Honest framing: for most women with both tubes blocked, IVF — not surgery — is the effective path to pregnancy. Surgery is reserved for carefully selected milder cases. Dr. Shweta Agarwal will explain which applies to you.
When should I see a specialist?
You should seek evaluation if:
- You have been trying to conceive for 12 months (or 6 months if you are 35 or older) without success.
- You have a history of pelvic infection, PID, or a sexually transmitted infection.
- You have had a previous ectopic pregnancy or pelvic/abdominal surgery.
- You have been diagnosed with endometriosis.
- You have a history of, or risk factors for, genital tuberculosis.
A tubal evaluation is straightforward and gives clear, actionable information. Aansh Hospital & IVF Center provides consultations in Marathi, Hindi, and English.