Article produced in association with Spital Clinic

Around 1.5 million women in the UK are living with endometriosis — and behind that number is a shared experience that rarely makes headlines.

According to NHS guidance on endometriosis, it is one of the most common gynaecological conditions in the country. And yet for most of the women it affects, getting a diagnosis took years.

The path to that diagnosis is rarely straightforward. It is long, often lonely, and filled with appointments where very real pain is explained away or missed entirely.

The Scale of the Diagnosis Delay

The Endometriosis UK 2024 Impact Report, drawn from responses by 4,371 women with confirmed endometriosis, puts the average time from first experiencing symptoms to receiving a diagnosis at 8 years and 10 months.

Despite growing awareness and repeated calls from clinicians for earlier investigation, that figure has barely shifted in a decade.

The numbers behind that average are striking.

The same report found that 47 per cent of those women had visited their GP ten or more times before getting a diagnosis, and 78 per cent said they felt dismissed when they first raised their symptoms — up from 69 per cent in the previous survey.

That isn’t a rounding error. It is the lived reality of most women with endometriosis.

Endometriosis happens when tissue similar to the uterine lining grows outside the uterus — on the ovaries, fallopian tubes, bowel, bladder and beyond.

Because it responds to the same hormonal cycle as the uterus, it causes recurring inflammation and scarring that cannot resolve on its own. The longer it goes undiagnosed, the more opportunity there is for it to progress.

Why Diagnosis Takes So Long

Part of the problem is that there is no simple test for endometriosis. Its symptoms — painful periods, chronic pelvic pain, pain during sex, bowel and bladder problems, and persistent fatigue — overlap with conditions that GPs see far more often.

IBS and painful periods are among the most frequent misdiagnoses before endometriosis is finally considered.

There is no blood test that confirms it.

NICE guidance acknowledges something that many women already know from experience: there is a long-standing tendency — both culturally and in clinical practice — to treat severe period pain as a normal part of female life.

When pain that disrupts daily function is met with reassurance rather than investigation, the referral that might eventually lead to a diagnosis simply does not happen.

That is where much of the delay originates.

For women whose symptoms have been raised repeatedly without investigation, a specialist gynaecological assessment — through NHS referral or through a private gynaecology consultation — tends to move things forward more quickly than further appointments at GP level.

What NICE NG73 Now Recommends

In November 2024, NICE NG73 — the updated endometriosis guideline — set out a clearer diagnostic pathway: defined criteria for when to investigate, when to refer, and what tests should happen first.

The guideline recommends transvaginal ultrasound as part of the initial investigation for suspected endometriosis.

Crucially — and this is worth knowing — a normal scan does not rule out endometriosis.

Many women are told their results were clear and assume that means the matter is settled. It does not.

A scan creates objective evidence that strengthens the case for specialist referral — something a physical examination alone often cannot do.

It can be arranged through an NHS referral or through a private transvaginal ultrasound, and specialist assessment is recommended where symptoms continue regardless of what the scan shows.

A normal scan is not a closed door.

The definitive test for endometriosis remains laparoscopy — a keyhole surgical procedure under general anaesthetic that allows a surgeon to see endometrial deposits directly and, where possible, treat them at the same time.

NG73 supports laparoscopy as the appropriate next step when non-invasive assessment does not provide a clear answer. Knowing that this option exists — and that it is appropriate to ask for it — makes a real difference.

What to Do if Your Symptoms Are Not Being Investigated

The most useful thing to do right now is start documenting. Write down dates, severity, how your symptoms relate to your cycle, and the specific ways they are affecting your life — across at least two or three full cycles.

A written record is far harder to dismiss than a verbal account given at a single appointment.

A symptom diary is the single most useful document a woman can bring to a GP appointment.

When you ask for a referral, be specific — ask for a gynaecologist with a specialist interest in endometriosis, not a general gynaecology appointment.

Under NHS England’s patient choice framework, you have the right to request referral to a named provider, including specialist endometriosis centres.

If a GP declines to refer you despite a persistent symptom history, requesting a second opinion from a colleague within the same practice is a reasonable and available step.

Endometriosis affects around 1 in 10 women of reproductive age, according to NHS guidance. That is not a rare condition — and yet the gap between how common it is and how promptly it gets diagnosed remains enormous.

NICE NG73 sets a clearer standard for what investigation should look like, but guidelines change slowly and practice can lag behind.

The women who tend to move through the system fastest are the ones who know what they are entitled to ask for: a transvaginal ultrasound, onward specialist referral, and the understanding that a normal scan is not the end of the road.

If this applies to you, book a consultation with a consultant gynaecologist to begin a structured assessment.

This article is produced for informational purposes only and does not constitute medical advice, diagnosis or treatment. Clinical guidance referenced reflects published NHS and NICE standards as at March 2026. Individual circumstances vary; readers are advised to consult a qualified healthcare professional before acting on any information in this article. This piece was produced in association with Spital Clinic, which provided background clinical information for editorial purposes. Hyperlinks to external sources are included for reference only and do not represent an endorsement of any product, service or organisation.