Adenomyosis: The Condition That Took an Average of 11 Years to Diagnose — And Is Still Being Missed

Understanding Your Conditions
Written By Totally Fine Co

Most people have heard of endometriosis. Far fewer have heard of adenomyosis (pronounced ad-en-oh-my-OH-sis) — despite the fact that it causes some of the most debilitating (severely limiting) period and pelvic symptoms that exist, and despite the fact that diagnosis takes, on average, 11 years (Breton et al., 2025).

Eleven years. And that's the average.

What is adenomyosis?

Adenomyosis is a condition in which the endometrial tissue (the lining that normally lines the inside of your womb, shedding during your period) grows into the muscular wall of the womb itself, called the myometrium (my-oh-MEE-tree-um). Each month, this tissue responds to hormonal changes the same way the womb lining does — thickening, breaking down, and bleeding. But because it's trapped inside the muscle, that blood has nowhere to go. This causes the muscle to swell and leads to significant pain, pressure, and heavy bleeding.

What does it feel like?

Adenomyosis can feel different for different people. Common symptoms include:

  • Very heavy periods (menorrhagia — men-oh-RAY-jee-ah) — soaking through pads or tampons, passing large clots

  • Severe period cramping that doesn't respond to standard painkillers

  • A feeling of fullness, pressure, or "bloating" in the lower abdomen (belly area)

  • Chronic (long-term, ongoing) pelvic pain — not just around your period

  • Pain during sex

  • Fatigue that feels disproportionate (worse than you'd expect)

  • An enlarged (bigger than normal) uterus (womb)

It's worth noting that adenomyosis often coexists (occurs at the same time) with other conditions, including endometriosis and uterine fibroids (non-cancerous growths in or around the womb). This can make the diagnostic journey even more complex.

Why does it take so long to diagnose?

A 2025 study of nearly 7,000 women found that the average diagnostic delay for adenomyosis was 11 years — longer even than for endometriosis (Breton et al., Journal of Women's Health, 2025). Contributing factors include:

  • Heavy, painful periods being normalised (treated as just "bad periods")

  • Symptoms that overlap with other conditions

  • Limited awareness among GPs (general practitioners / family doctors) compared to gynaecology specialists

  • Historical reliance on hysterectomy (surgical removal of the womb) as the only definitive diagnosis — though imaging technology (transvaginal ultrasound and MRI) is increasingly being used earlier

Can it be treated without surgery?

Yes. While hysterectomy was historically the main treatment, there are now a range of options including hormonal treatments (such as the coil, progestogen — a hormone — tablets, or GnRH analogues — medications that reduce oestrogen levels temporarily), anti-inflammatory medications, and in some cases, uterine artery embolisation (UAE — a procedure that blocks blood flow to problematic tissue). Treatment is very individual, and what works for one person may not work for another.

If you recognise these symptoms in yourself, please know: a difficult period does not have to be your normal. Symptoms that affect your quality of life deserve investigation, not just management.

References:

This post is for educational and informational purposes only. It does not constitute medical advice or diagnosis. If you are concerned about your symptoms, please speak with a qualified healthcare provider.

Totally Fine Co
Previous

The Gender Pain Gap Is Real — And the Research Proves It
Next

How to Prepare for a Gynaecology Appointment When You've Been Dismissed Before