Lack of Awareness Among Women About Breast Density Risks

Sunday, June 14, 2026

A survey of 2,000 women found that 90% are unaware of their breast density, a key factor that increases breast cancer risk and can make mammograms less effective. Since dense breast tissue can obscure cancer detection, experts recommend supplementary imaging methods to improve diagnosis and better inform women about their individual risk.

A recent survey has revealed that nine in ten women are unaware of their breast density, a significant factor linked to breast cancer risk and detection. The study, which involved 2,000 respondents, also found that over half of women did not recognize the connection between breast density and cancer.

Breast density describes the proportion of glandular and connective tissue relative to fat in the breast. Women with denser breast tissue not only face a higher risk of developing breast cancer, but the tissue can also make mammograms less effective. This is because both dense tissue and tumors appear white on mammograms, which can obscure the detection of cancerous growths.

For women with moderately dense breasts—approximately one third of the population—the risk of breast cancer is estimated to be four times higher than in those with less dense tissue. The risk rises to as much as six times for the 10 percent of women with the densest breast tissue. Despite these risks, breast density is often not recorded in medical notes following routine screening.

More than 40 percent of women in the UK have dense breasts, yet unlike in the United States and many European countries, this information is frequently not communicated to them. The survey found that nearly 75 percent of women expressed a desire to be informed about their breast density status. Importantly, breast density does not correlate with the breast’s appearance, including its size, shape, or how it feels.

Breast cancer remains the most common cancer in Britain, with around 56,000 new cases diagnosed annually. While survival rates have improved—approximately 90 percent survive the disease—breast cancer still results in more than 11,000 deaths each year. Screening programs play a vital role in early detection and treatment, but their effectiveness can be limited for women with dense breasts.

Research conducted by the University of Cambridge and Addenbrooke’s Hospital estimates that standard mammograms miss over 3,500 cases of breast cancer each year due to breast density factors. The researchers suggest that integrating additional imaging techniques, such as MRI or ultrasound, alongside mammography could potentially triple cancer detection rates in this group.

The survey was commissioned by Micrima, a private clinic specializing in breast density assessment. Its chief executive, Adrian Waller, emphasized the importance of increasing awareness and providing women with tailored information about breast density to empower them in their health decisions. “For too long, breast density has been an unknown for many women, despite the role it can play in both cancer risk and detection,” he said.