If you are having difficulty becoming pregnant, your doctor may recommend a hysterosalpingogram (HSG), which can naturally raise another question: can HSG detect endometriosis? The answer is no, not directly. An HSG is primarily used to examine the uterine cavity and check whether the fallopian tubes are open. It may reveal tubal abnormalities associated with pelvic disease, but it cannot reliably identify all endometriosis lesions.

What Is an HSG Test?

HSG stands for hysterosalpingography. It is an imaging test in which contrast dye is placed through the cervix into the uterus and fallopian tubes while X-ray images are taken.

Think of it like putting colored water through a narrow plumbing system. If the pathway is open, the dye can pass through the fallopian tubes and spill beyond their ends. If there is an obstruction, the flow may stop or become abnormal.

That is why HSG is particularly useful when doctors want to assess fallopian tube patency.

ACOG explains that HSG can identify whether the tubes are partly or completely blocked and can also show whether the uterus has a normal size and shape. It may therefore be an important part of an infertility investigation.

But here is the key point: checking whether a tube is open is not the same as checking whether endometriosis is present.

Endometriosis can affect areas of the pelvis that an HSG does not adequately visualize.

Can HSG Detect Endometriosis?

No, HSG cannot reliably diagnose endometriosis.

A normal HSG can tell you that the uterine cavity and fallopian tubes appear satisfactory on that examination. It cannot tell you that the entire pelvis is free from endometriotic lesions.

This distinction is critical. A person can have open fallopian tubes and still have endometriosis affecting the ovaries, pelvic peritoneum, bowel, bladder, or other pelvic structures.

HSG can provide valuable fertility information, but it is not an endometriosis-specific investigation and cannot reliably confirm or exclude the disease.

Why HSG Is Not an Endometriosis-Specific Test

An HSG is essentially a map of the pathway followed by contrast through the uterus and fallopian tubes. Endometriosis is a disease involving lesions outside the uterine cavity, so much of the relevant disease lies beyond what HSG is designed to assess.

A 2020 radiology review specifically examined the role of HSG in patients with endometriosis and infertility, highlighting its usefulness for tubal assessment while emphasizing its limitations in evaluating endometriotic disease.

The Difference Between Tubal Problems and Endometriotic Lesions

A blocked or distorted fallopian tube is a tubal finding. Endometriosis is a disease process that may or may not cause tubal abnormalities.

For example, endometriosis can contribute to inflammation and adhesions that alter pelvic anatomy, but a blocked tube can also result from previous infection, surgery, or other tubal disease. Therefore, an abnormal HSG does not automatically mean that you have endometriosis.

Why Can’t HSG Reliably See Endometriosis?

The limitation becomes easier to understand when you compare what HSG images with where endometriosis can develop throughout the pelvis.

HSG Focuses on the Uterus and Fallopian Tubes

The contrast used during HSG outlines the inside of the uterus and the fallopian tubes. It is excellent for following the route of the dye, but it does not provide a comprehensive view of the surrounding pelvic tissues.

That means HSG is answering a focused question: Are the tubes open and does the uterine cavity appear normal?

It is not answering: Is there endometriosis anywhere in the pelvis?

Endometriosis Usually Develops Outside the Uterine Cavity

Endometriosis may involve the ovaries, pelvic peritoneum, bowel, bladder, ureters, and other pelvic structures. Some forms create larger or deeper abnormalities that can be identified with specialist imaging, while superficial disease can be much harder to visualize.

What an HSG May Miss

An HSG may miss superficial endometriosis, small pelvic implants, ovarian endometriomas, deep lesions away from the tubes, and disease affecting bowel or bladder structures.

So, can HSG detect endometriosis? In most cases, it cannot see the disease itself, particularly when the lesions do not alter the shape or function of the tubes.

Can HSG Show Indirect Signs of Endometriosis?

Although HSG does not directly diagnose endometriosis, certain tubal or peritubal findings can sometimes provide indirect clues that deserve further clinical interpretation.

Tubal Blockage and Distortion

Endometriosis can be associated with pelvic inflammation, scarring, and adhesions. If these processes affect the fallopian tubes, HSG may show abnormalities such as tubal obstruction, altered contour, or distortion.

Research has demonstrated that endometriosis can produce tubal abnormalities visible on HSG in some patients. However, the detection is not sufficiently reliable to use HSG as an endometriosis diagnostic test.

Adhesions and Peritubal Abnormalities

Pelvic adhesions can change how the fallopian tubes lie or how contrast spills around them. These findings may raise suspicion of peritubal adhesive disease.

But there is an important limitation: a meta-analysis found that HSG is not reliable for evaluating peritubal adhesions.

Why Abnormal HSG Findings Do Not Prove Endometriosis

An abnormal HSG is a piece of evidence, not a diagnosis. Tubal blockage, narrowing, or distortion has a broad differential diagnosis.

Your symptoms, medical history, fertility history, ultrasound findings, MRI findings, and examination all help determine whether endometriosis is actually likely.

Can You Have Endometriosis With a Normal HSG?

Yes. A normal HSG and the absence of endometriosis are not the same thing, because HSG evaluates only a limited portion of pelvic anatomy.

Why a Normal Result Does Not Rule Out Disease

This is one of the most important facts to understand: a normal HSG does not rule out endometriosis.

Current NICE guidance recommends transvaginal ultrasound for people with suspected endometriosis and specifically states that endometriosis should not be excluded simply because an examination and ultrasound are normal.

If ultrasound can sometimes miss the disease, an HSG—which has a different and narrower purpose—certainly should not be used to exclude it.

Normal Tubes Do Not Mean a Normal Pelvis

Imagine checking whether two roads are open and then assuming the whole city has no traffic problems. The roads may be clear while problems exist elsewhere.

The same principle applies to your pelvis. Your fallopian tubes may be open while endometriosis affects an ovary, bowel, bladder, pelvic peritoneum, or other tissue.

What Symptoms Should Prompt Further Evaluation

Further assessment may be appropriate when you experience severe period pain, chronic pelvic pain, deep pain during sex, painful bowel movements, cyclical urinary symptoms, persistent symptoms despite treatment, or unexplained infertility.

These symptoms do not prove endometriosis, but they can justify a more targeted evaluation.

What Tests Can Help Diagnose Endometriosis?

Modern endometriosis diagnosis is increasingly based on combining symptoms, clinical assessment, specialist imaging, and selected surgical evaluation rather than relying on one test alone.

Transvaginal Ultrasound

A transvaginal ultrasound is commonly used in suspected endometriosis. A specialist scan can identify ovarian endometriomas and certain forms of deep endometriosis and can also look for other conditions that may explain symptoms.

The expertise of the person performing and interpreting the scan matters, especially when deep endometriosis is suspected.

Pelvic MRI

Pelvic MRI can provide detailed information about soft tissues and is particularly helpful when doctors need to map suspected deep or extensive endometriosis.

NICE recommends specialist transvaginal ultrasound or pelvic MRI when deep endometriosis is suspected, with interpretation by professionals who have relevant gynecological imaging expertise.

Clinical Assessment

Your symptoms are not simply background information—they are part of the diagnostic process.

ACOG’s 2026 Clinical Practice Guideline specifically covers the clinical, imaging, and surgical evaluation and diagnosis of endometriosis, reflecting a more comprehensive approach to the condition.

When Is Laparoscopy Considered?

Laparoscopy allows a surgeon to directly inspect the pelvis and, where appropriate, treat visible endometriosis during the same procedure.

However, laparoscopy is not automatically required for every person with suspected disease. NICE recommends considering it in selected patients even when ultrasound or MRI is normal, while the Canadian SOGC states that surgical diagnosis should not be used as the primary investigation tool for everyone.

HSG vs Ultrasound vs MRI vs Laparoscopy

Each investigation answers a different clinical question, so the most appropriate test depends on symptoms, fertility goals, suspected disease location, and previous results.

Test	Main purpose	Role in endometriosis
HSG	Tubal patency and uterine cavity	Does not reliably diagnose endometriosis
Transvaginal ultrasound	Pelvic and ovarian assessment	Can detect endometriomas and some deep disease
Pelvic MRI	Detailed pelvic soft-tissue imaging	Useful for mapping deep/extensive disease
Laparoscopy	Direct pelvic visualization	Can identify lesions and may allow treatment

What If Your HSG Is Normal but You Still Have Symptoms?

A normal HSG can be reassuring about tubal patency, but persistent symptoms should still be considered separately rather than being dismissed because the dye passed normally.

Ask what the complete clinical picture suggests. Your doctor may consider a specialist transvaginal ultrasound, MRI, or other evaluation depending on your symptoms and fertility plans. Current Canadian guidance emphasizes an individualized diagnostic pathway based on the patient’s presentation and priorities.

For someone undergoing fertility treatment, this distinction can be especially important. HSG may answer the tubal question while leaving the endometriosis question unanswered.

Endometriosis Evaluation and Treatment With Dr. Lucas Minig in Spain

Specialist evaluation can be useful when symptoms, fertility concerns, imaging results, or previous treatments do not provide a clear explanation for what you are experiencing.

Dr. Lucas Minig’s practice in Valencia, Spain, provides endometriosis evaluation alongside individualized medical management and minimally invasive surgical care. The clinic describes treatment options for endometriomas, deep endometriotic implants, and pelvic adhesions, while considering pain and fertility goals.

For international patients, Dr. Lucas Minig also provides online consultation options, which can allow a medical history and existing reports—including HSG, ultrasound, or MRI findings—to be reviewed before an in-person visit. Dr. Minig performs the majority of complex procedures using minimally invasive laparoscopic or robotic techniques.

This can be particularly relevant when an HSG is normal but symptoms continue and a more comprehensive endometriosis assessment is needed.

Conclusion

The key takeaway is simple: can HSG detect endometriosis? No, not reliably. HSG is primarily a test for fallopian-tube patency and the uterine cavity, so a normal result cannot exclude endometriosis elsewhere in the pelvis.

If symptoms or infertility concerns remain, the next step may involve clinical assessment, specialist ultrasound, MRI, or selected surgical evaluation. Current international guidance supports using these tools together rather than expecting one test to provide every answer.

FAQ’s

1. Can HSG detect endometriosis if my tubes are blocked?

Not necessarily. A blocked tube can have many causes. Endometriosis may contribute to pelvic adhesions or tubal distortion, but an abnormal HSG alone cannot confirm endometriosis.

2. Can you have endometriosis with open fallopian tubes?

Yes. Open fallopian tubes do not rule out endometriosis. The disease may affect the ovaries, peritoneum, bowel, bladder, or other pelvic structures without causing tubal blockage.

3. Can HSG show endometriosis adhesions?

HSG can sometimes suggest peritubal abnormalities, but it is not a reliable test for diagnosing pelvic adhesions. A meta-analysis concluded that HSG was not reliable for evaluating peritubal adhesions.

4. Is MRI better than HSG for endometriosis?

They have different purposes. HSG assesses the uterine cavity and tubal patency, while specialist pelvic MRI can help identify and map suspected deep endometriosis.

5. What should I do if my HSG is normal but I still have endometriosis symptoms?

Discuss the result with a gynecologist or endometriosis specialist. Depending on your symptoms, further assessment may include transvaginal ultrasound, pelvic MRI, fertility evaluation, or laparoscopy.