Adenomyosis vs fibroids: how to tell the difference

The short answer

Fibroids are firm, benign muscle growths in or on the wall of the uterus — often discrete lumps. Adenomyosis is different: it is when tissue similar to the uterine lining grows into the muscular wall, making the uterus diffusely enlarged, “boggy” and tender. Both commonly cause heavy, painful periods — but the imaging findings and the best treatment differ, and the two can exist in the same uterus.

Adenomyosis vs fibroids at a glance

How each is diagnosed

Both are usually assessed first with a good-quality pelvic ultrasound. Fibroids typically appear as well-defined masses; adenomyosis shows more diffuse changes in the uterine wall and is often best characterised on MRI. A careful history — the pattern of your bleeding and pain — is just as important as the imaging. Heavy or changing periods always deserve a clear, cause-first menstrual assessment rather than guesswork.

Treatment — uterus-sparing first

Many women with either condition are managed without surgery. For fibroids, options range from watchful waiting to medical therapy to myomectomy (removing the fibroids while keeping the uterus) — surgery only on a clear indication. Adenomyosis is often controlled medically; surgery is considered selectively. Our consistent principle is to preserve the uterus wherever it is safe and appropriate, and to align treatment with your fertility goals.

When they occur together

Adenomyosis and fibroids frequently coexist, which is one reason a precise assessment matters — treating only one when both are present can leave symptoms unresolved. Where the two overlap, or where adenomyosis is confused with endometriosis, see our explainer on endometriosis vs adenomyosis.

Our approach

We map the problem accurately, explain what is driving your symptoms, and start with the least invasive option that genuinely fits — preserving the uterus wherever appropriate and never recommending surgery without a clear, shared reason. Care is led by Dr. Priyadatt Patel. Not sure which applies to you? Start with our conditions guide or book an assessment.

Frequently asked questions