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About one in two women ages 40 and over have dense breasts. As common as it may be, many women still have questions about breast density, in part because myths and misinformation make the topic harder to understand. So, what defines a “dense breast” and why does it matter? Here are five myths to clear up what breast density does and does not mean.
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What does having dense breasts actually mean?
To understand what breast density actually means, start with the anatomy. Breasts are made up of three types of tissue: fibrous tissue (the supportive structure), glandular tissue (the part that makes milk), and fatty tissue (providing their shape and size). Having dense breasts simply means that you have more fibrous and glandular tissue than fatty tissue.
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Myth #1: You can feel dense breasts
No, you cannot feel dense breasts. Breast density cannot be determined by touch or physical examination; it is assessed based on the appearance of breast tissue on a mammogram.
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Breasts that feel firm, thick or lumpy aren’t necessarily considered dense on imaging tests. Also important: breast lumps or changes you can feel or see are entirely different from dense breasts. While most lumps are non-cancerous, lumps, growths, or swelling are red flags that you need an exam because these may be signs of breast cancer. Any new or concerning changes should be to be discussed with a healthcare provider rather than assuming it’s due to breast density.
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Myth #2: Dense breast tissue means something is wrong
Breast cancer is common—affecting one in eight women over their lifetimes—so learning that you have dense breasts can set off alarm bells. But it’s important to remember that breast density is simply a category of the tissue makeup of your breasts, and it doesn’t indicate that you have cancer.
However, dense breasts are considered a risk factor for breast cancer, something that one out of two women aren’t aware of, according to research in the Journal of Women’s Health. Researchers are still studying why dense breast tissue is associated with increased breast cancer risk. Several biological mechanisms may contribute, including differences in the amount and characteristics of fibroglandular tissue. . That said, breast density is one of many other risk factors, including being older than 55, having a family history, drinking alcohol, living a sedentary life, and smoking.
Myth #3: Mammograms don’t work if you have dense breasts
Dense breast tissue can make a mammogram harder for radiologists to read. Fatty tissue usually appears dark, while dense glandular and fibrous tissue appears white. Since many breast abnormalities also appear white, that “white-on-white” picture can make some findings harder to see.
However, that does not mean that you don’t need a mammogram. No matter what the makeup of your breasts, attending recommended mammogram screening appointments is an important part of breast cancer screening and can help identify some cancers at an earlier stage. Since 2024, the FDA has required mammogram facilities in the U.S. to include breast density information in patient reports.
The U.S. Preventive Services Task Force says there isn’t currently enough evidence to recommend for or against additional ultrasound or MRI screening for women with dense breasts after a normal mammogram. Still, breast density is worth bringing up with your doctor, who can help you weigh your screening options in the context of your personal and family health history.
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While Prenuvo’s Whole Body Scan is not intended to be a replacement for a mammogram, it may provide additional information about breast tissue as part of a broader MRI scan, along with images of other areas of the body.
Myth #4: Breast density stays the same throughout your life
Just like everything else about you, your breasts and their density can change throughout your life. According to the Centers for Disease Control and Prevention (CDC), breast density is more likely in younger women, those who are pregnant or breastfeeding, are taking hormone replacement therapy, or have a lower body weight. Research also indicates that density may decrease in women with age, possibly because mammary glands shrink. That said, for many women—65% in one study—breast density stayed the same over a 10-year study period. While you can’t predict what trajectory your breasts will take as time goes on, you can stay up-to-date on your breast density with regular mammograms.
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Myth #5: Dense breasts only matter if breast cancer runs in your family
Breast density is an independent risk factor for breast cancer whether you have a family history or not. Knowing your family history is important as having a first-degree relative (your mom, your sister) diagnosed with breast cancer nearly doubles your own risk, according to the American Cancer Society.
Knowing your breast density can add useful context when discussing your own risk profile, preventative plan, and screening steps with your healthcare provider. Continue to follow guideline-recommended breast cancer screening based on your individual circumstances no matter the size, shape, or density of your breasts.
What dense breasts mean for your screening routine
For women at average risk, the USPSTF recommends screening mammography every two years from ages 40 through 74. Your doctor may recommend starting earlier, screening more often or using additional imaging if you have other risk factors, such as a strong family history or a genetic predisposition.
Since 2024, the FDA has required mammography facilities in the U.S. to include breast density information in patients’ written results. If your report describes your breasts as dense, that information can be part of a conversation with your doctor about your overall risk and screening options.
Depending on your individual factors, your doctor may discuss supplemental imaging, such as:
- Breast ultrasound: Ultrasound uses sound waves to create images of breast tissue. It may help evaluate an area that appears unclear on a mammogram or identify some findings that are harder to see in dense tissue. Ultrasound can also lead to additional testing for findings that turn out to be benign, so your doctor can help you weigh the potential benefits and limitations.
- Breast MRI: A dedicated breast MRI uses radio waves and strong magnets to create detailed images of the breasts and may be recommended for people with certain risk factors. It serves a different purpose from a mammogram and is generally ordered based on a person’s individual risk profile and screening needs.
Prenuvo’s Whole Body Scan uses MRI to image multiple areas of the body, including breast tissue, as part of a broad scan. It can provide additional information to discuss with your doctor, while dedicated breast imaging remains the appropriate tool for breast-specific screening. The Whole Body Scan is designed to complement recommended medical care and does not replace mammography, breast ultrasound, dedicated breast MRI or other screenings your doctor recommends.
Your breast density is one part of your overall health picture. Continue following your doctor’s screening recommendations and have an open conversation about any questions, changes or additional testing that may be appropriate for you.
To learn more about a Prenuvo Membership or standalone services, book a call with the Patient Services Team.
