You were told you have dense breasts. What now?
Since 10 September 2024 the FDA has required every mammography facility in the country to tell you whether your breasts are dense. A lot of people received that sentence for the first time and had no idea what to do with it.
What density is
Breasts are made of fatty tissue and fibroglandular tissue. Fibroglandular tissue appears white on a mammogram. So do many tumours. The more dense tissue you have, the more places a small cancer can hide.
It is common
Roughly half of women over 40 in the United States have dense breasts. It is not a disease, not a diagnosis and not something you caused. It also tends to decrease with age.
It is a modest risk factor
Dense tissue is associated with a somewhat higher risk of developing breast cancer, separately from making detection harder. Both facts are worth knowing; neither is cause for panic.
What to do about it
Ask a clinician whether supplemental imaging — ultrasound or MRI — makes sense given your density and your other risk factors. And keep screening. A mammogram that is harder to read is still far better than no mammogram.
Questions about this
Does dense tissue mean I have cancer?
No. Density describes the proportion of fibroglandular to fatty tissue and nothing more. About half of women over 40 have dense breasts. It is common, it is not a diagnosis, and it is not something you caused.
FDA — Understanding Breast Density ↗Why was I only told about this recently?
Because the FDA made it mandatory. Since 10 September 2024 every mammography facility in the United States must report breast density in the results letter. Many people received that sentence for the first time and had no context for it.
FDA — breast density reporting rule (effective 10 Sep 2024) ↗Should I have an ultrasound or MRI as well?
Possibly — it depends on your density together with your other risk factors, and it is a decision to make with a clinician. Supplemental imaging finds more cancers and also produces more false positives, so it is a judgement rather than an automatic yes.
FDA — Understanding Breast Density ↗Is a mammogram still worth it if my breasts are dense?
Yes. Dense tissue makes a mammogram harder to read; it does not make it useless. A harder-to-read mammogram is still far better than no screening at all.
FDA — Understanding Breast Density ↗Book it yourself
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Create an account to get started →Mammo Express is a scheduling service, not a medical provider. We do not provide medical advice, perform imaging or interpret results. Screening is carried out by independent FDA-certified facilities. If you have noticed a lump or any change in your breast, contact a clinician — that needs a diagnostic exam, not a screening appointment.