Breast Cancer Rates Are Rising in Canada — What You Need to Know

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New Canadian research shows breast cancer diagnoses are climbing fastest among women in their 20s, 30s, and 40s, a group that falls outside standard screening programs. Here is what the numbers actually say, why it is happening, and concrete steps you can take today, whatever your age.

For decades, breast cancer was thought of as a disease of older age. New Canadian data is challenging that assumption, and the numbers are worth paying close attention to, especially if you are under 50.

The Numbers That Are Going Up

A landmark Canadian trend analysis, led by Dr. Jean Seely at The Ottawa Hospital and published in the Canadian Association of Radiologists Journal, tracked breast cancer cases across 35 years using Statistics Canada national cancer registries. The findings were striking:

A. Women in their 20s: A 45.5% increase in breast cancer cases over 35 years

B. Women in their 30s: A 12.5% increase

C. Women in their 40s: A 9.1% increase, with a statistically significant acceleration between 2015 and 2019

The research team, which also included Statistics Canada Larry Ellison and University of Ottawa Dr. Anna Wilkinson, found that increasing trends were statistically significant across every age group under 50 studied.

To put this in the context of 2026 as a whole, the Canadian Cancer Society estimates 32,400 women in Canada will be diagnosed with breast cancer this year, and 5,400 will die from it. That works out to roughly 89 new diagnoses and 15 deaths every single day. Breast cancer now accounts for 26% of all new cancer cases in Canadian women and remains the second leading cause of cancer death in women, behind only lung cancer.

There is real nuance in these numbers, though. Overall age standardized mortality has actually fallen substantially since peaking in 1986, thanks to earlier detection and better treatment. The concerning trend is not that breast cancer overall is becoming more common. It is that it is becoming more common specifically in younger women, a group that screening programs were not originally built around.

Why This Age Group Is Especially Vulnerable

Dr. Seely, who has spent years studying this shift, points to a specific problem: younger women are not part of routine screening. Most Canadian screening programs are designed around women aged 50 to 74. That means when breast cancer does appear in a woman's 20s, 30s, or early 40s, it is often caught later, and later stage cancer in younger women tends to be more aggressive to begin with.

There is also a physical barrier at play. Younger women more often have dense breast tissue, which makes tumours harder to spot on a standard mammogram and can delay diagnosis further.

Researchers are also documenting real disparities by race and background. Data published in The Oncologist shows that Black, First Nations, and Métis women in Canada tend to be diagnosed earlier in life and, in several age groups, face higher mortality than white women. Black women in Canada are also more likely to develop triple negative breast cancer, a more aggressive subtype with fewer targeted treatment options. Filipina and multiethnic women aged 40 to 49 showed higher incidence rates than white women in the same age group.

Geography matters too. A 2026 Statistics Canada study found breast cancer mortality is highest in rural Eastern Canada and among women in Manitoba and Saskatchewan, while Montreal, Toronto, and Vancouver have the lowest death rates. This is a gap that researchers and clinicians link to uneven access to mammogram technology and screening infrastructure, particularly in rural and remote communities.

What Is Changing in Response

The research has already started shifting policy. As of 2024 to 2026, every Canadian province and territory except Quebec has lowered the minimum mammogram eligibility age from 45 down to 40, giving more younger women access to publicly funded screening. Quebec is reportedly reviewing similar changes.

Dr. Seely and Dr. Wilkinson have been outspoken in calling for continued change. Healthcare providers and the public both need better awareness that breast cancer is no longer something to rule out just because someone is in their 20s or 30s. As Seely put it, strategies and policies need to adapt to reflect these shifting trends so that all women, regardless of age, have the information and resources to detect and address the disease early.

Patient advocacy groups are pushing further. Breast Cancer Canada's #MakeMeCount campaign and its PROgress Tracker registry are collecting long term, patient reported data specifically to fill gaps in how younger women's outcomes are tracked over time. This includes what happens years after an "all clear," since a portion of early stage patients later experience metastatic recurrence that current 5 year survival statistics do not fully capture.

What You Can Actually Do

Whether you are in your 20s or your 60s, here is what the research supports:

• Know your body, regardless of your age: Most public awareness campaigns still target women over 50. If you notice a lump, changes in shape, skin texture, or nipple discharge at any age, do not dismiss it or assume you are too young. Bring it to a doctor.
• Ask about your personal risk factors: Family history, genetic mutations like BRCA1 or BRCA2, and certain ethnic backgrounds can put you at higher than average risk. If any of these apply to you, ask your doctor whether earlier or more frequent screening makes sense for you specifically, even if you are under the general screening age.
• Check your province's current screening age: Most Canadian provinces and territories now offer publicly funded mammograms starting at age 40, a recent change specifically driven by this research. If you are 40 or older, find out how to book your first screening.
• Push back if you are told you are too young: Advocates like Chelsea Bland, who was diagnosed at 28 after her own self exam, have spoken publicly about being dismissed by providers because of their age. If a concern is not being taken seriously, ask for further investigation or a second opinion.
• Understand that dense breast tissue can hide tumours: If you have been told you have dense breasts, ask your doctor what that means for your screening plan. Supplemental imaging may be worth discussing.
• Support better data collection: Initiatives like the PROgress Tracker rely on patients voluntarily sharing their experiences. If you have been diagnosed with breast cancer, contributing your data helps build the evidence base that is already reshaping screening policy across the country.

The Bottom Line

Breast cancer in Canada is not simply going up in a uniform way. It is rising fastest in groups the healthcare system has not traditionally focused on: younger women, some racialized communities, and people in under resourced regions.

The encouraging part is that this research is already changing screening guidelines in real time. The most important thing you can do is stay informed about what applies to your age, background, and risk profile, and not wait for a system built around outdated assumptions to catch up.

This post is for general informational purposes and is not a substitute for medical advice. If you have concerns about your personal risk or symptoms, please speak with your healthcare provider.

Sources

1. Seely, J.M., Ellison, L.F., Billette, J.M., Zhang, S.X., Wilkinson, A.N. "Incidence of Breast Cancer in Younger Women: A Canadian Trend Analysis." Canadian Association of Radiologists Journal, 2024.
2. University of Ottawa news release, "Breast cancer rates rising among Canadian women in their 20s, 30s and 40s," 2024.
3. Breast Cancer Canada, coverage of Seely study and #MakeMeCount and PROgress Tracker initiative.
4. Wilkinson, A.N., Ng, C., Ellison, L.F., Seely, J.M. "Breast cancer incidence and mortality, by age, stage and molecular subtypes, by race/ethnicity in Canada." The Oncologist, 2025.
5. Canadian Cancer Society, Breast Cancer Statistics, 2026.
6. Rethink Breast Cancer, Breast Cancer Statistics in Canada, 2026.
7. Statistics Canada, regional breast cancer incidence and mortality study, 2026.
8. Canadian Medical Association Journal (CMAJ), Canadian Cancer Statistics projections, 2026.