Breast ultrasound and mammography are different tests. Ultrasound uses sound waves, while mammography uses low-dose X-rays. A breast clinician or imaging team may choose one or both depending on your symptom, age, examination and previous imaging.
I do not advise choosing between these tests based on one symptom alone. The appropriate breast pathway begins with clinical assessment, then the team selects imaging that can answer the question safely.
Neither test provides a universal substitute for the other. A normal result still needs to be considered with your symptoms and examination.
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How the tests differ
The two tests create different types of images and may provide complementary information.
| Test | How it works | How it may be used |
|---|---|---|
| Breast ultrasound | Uses sound waves to create images | May assess a focused area or add information to another assessment |
| Mammography | Uses low-dose X-rays | May be selected for specific symptoms, age groups or screening pathways |
| Clinical assessment | History and examination | Guides whether imaging, breast clinic referral or another route is appropriate |
Why the clinical route matters
New lumps, skin or nipple changes, bloody discharge, persistent localised changes or new underarm lumps need prompt clinical assessment. The breast team may choose imaging as part of that pathway rather than sending you directly for a single test.
Questions to ask before imaging
Ask which test has been recommended, what it can and cannot show, whether a breast-clinic pathway is more appropriate, how you will receive the result and what happens if symptoms continue.
Frequently Asked Questions
References
- [1]Rebolj M et al. Addition of ultrasound to mammography in dense breast tissue: systematic review and meta-analysis. British Journal of Cancer.
- [2]Nothacker M et al. Benefits and risks of supplemental breast ultrasound in women with dense breast tissue: systematic review. BMC Cancer.
- [3]NHS. Breast cancer symptoms and when to seek assessment.
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