The short answer
Some breast cancer risk factors, like age and genes, cannot be changed. Others, like alcohol use and weight, can be. Having risk factors does not mean you will get breast cancer, and many people with breast cancer have no known risk factors.
Risk factors are things linked to a higher chance of getting breast cancer, not guarantees.
Factors that cannot be changed include age, sex, genes, and family history.
Factors you may be able to change include alcohol use, body weight after menopause, and physical activity.
Many people with breast cancer have no known risk factors at all.
On this page
Choose how you want to read this
The whole article, with every detail and caution.
This page is for anyone who wants to understand what raises the chance of breast cancer. It lists the factors you cannot change and those you may be able to change.
The simple version
A risk factor is something linked to a higher chance of getting breast cancer. It is not a cause, and it is not a promise. Some risk factors cannot be changed. Others might be.
Having a risk factor, even several, does not mean you will get breast cancer. Many people who get breast cancer have no known risk factors at all.
Factors you cannot change
- Getting older. NCI calls increasing age the most important risk factor besides female sex.
- Being female. Breast cancer is far more common in women. Men can get it too, but the lifetime risk is much lower.
- Inherited gene changes. NCI lists BRCA1, BRCA2, PALB2, CHEK2, TP53, CDH1, PTEN, STK11 and ATM among the genes linked to higher risk.
- Family history. Having a family history of breast cancer raises risk.
- Dense breast tissue. NCI says dense tissue raises risk and can also make mammograms harder to read.
- Reproductive history. NCI lists starting periods early, late menopause, an older age at first birth, never carrying a pregnancy to term, and not breastfeeding as factors that raise risk by affecting estrogen exposure.
- Radiation exposure. Radiation exposure raises risk, particularly at a young age, such as during treatment for childhood cancer.
Factors you may be able to change
- Alcohol. Drinking alcohol raises risk, and risk goes up with the amount consumed.
- Body weight. NCI links excess body weight, especially after menopause, to higher risk.
- Physical activity. NCI links not being physically active, especially after menopause, to higher risk.
- Combination hormone therapy. NCI links combination (estrogen plus progestin) hormone replacement therapy to higher risk. Ask your care team before changing any medicine.
In short: age and sex are the biggest factors, and many risk factors cannot be changed.
You did not cause this
If you have breast cancer, it is natural to look for a reason. But breast cancer usually comes from a mix of factors working together, most of which nobody can control. Having risk factors, or having none at all, does not mean you did anything wrong. Blaming yourself will not help your treatment or your recovery.
Why this matters for you
Knowing your own risk factors can help you and your care team decide when to start screening and whether extra testing, like genetic counseling, makes sense. It is one part of a bigger picture, not a verdict.
Sources
- National Cancer Institute, Breast Cancer Causes and Risk Factors
Common questions
Does having a risk factor mean I will get breast cancer?
No. A risk factor only means your chance is somewhat higher than someone without it. Most people with one or more risk factors never get breast cancer, and many people who do get breast cancer have no known risk factors.
What are the biggest risk factors for breast cancer?
NCI calls increasing age the most important risk factor besides female sex. Other factors include inherited gene changes such as BRCA1 or BRCA2, a family history of breast cancer, and dense breast tissue.
Can I lower my risk?
NCI links higher risk to alcohol (the more you drink, the greater the risk), excess weight after menopause, and not being physically active. Many other factors, like age and genetics, cannot be changed. Ask your care team what makes sense for you.
Did I cause my own breast cancer?
No. Breast cancer results from a mix of factors, many of which are outside anyone's control, such as age, genetics, and reproductive history. Having a risk factor, or even several, does not mean you did something to cause your cancer.
Are men at risk for breast cancer?
Yes, but it is much less common. NCI reports a lifetime risk of about 0.13% for men, roughly 1 in 800, compared with about 12.9% (1 in 8) for women.
Questions to ask your doctor
Being prepared helps you get the most out of your appointments. Save or print these questions.
Tap a question to save it to your list (kept on this device).
Talk with a trained specialist or navigator
Cancer Explained provides educational guidance, but does not replace trained specialists, social workers, or your medical team.
Talk to a trained cancer information specialist
Free, confidential assistance from NCI Cancer Information Service via phone, chat, or email.
Contact your oncology team
Locate after-hours contact numbers, portal messages, or urgent triage phone lines.
Find a patient navigator
Get one-on-one help with appointments, logistics, translation, and care coordination.
Find a genetic counselor
Discuss inherited mutation risk, family history, and genetic testing options.
Find an oncology social worker
Access emotional counseling, family support groups, and mental health resources.
Find a financial navigator
Locate copay assistance foundations, grant programs, and lodging/travel support.
Find a clinical-trial specialist
Search matching studies and speak with NCI trial information specialists.
Get urgent help
Fever of 100.4°F (38°C) or higher during chemo, severe pain, or trouble breathing: call your cancer care team right away, day or night. Call 911 for an emergency.
Know someone who needs this?
Plenty of people are looking for something like this and do not know where to start. If this would help a friend or someone you love, send it on — we have written an opening line so you do not have to stare at an empty message. You can change every word of it.
Your message is written and sent in your own email or messaging app — we never see who you send it to, and nothing is added to any list.
Plain-language explanation of the published sources cited on this page. AI-assisted, source-checked, not clinician-reviewed.
Last updated: 2026-08-18Next planned review: 2027-08-03
Review details and limits
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status — Source checked. This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
General education — varies by person. Answers genuinely differ between people. This page explains what commonly varies and points you to your care team for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
Words to know
Tap any term to see what it means.
How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
Read more about our editorial process, our use of AI, and our corrections policy.
Spotted a problem? Report an error — a factual mistake, broken or outdated source, confusing wording, or anything that seems unsafe. Please do not include names, medical record numbers, dates of birth, addresses, or other identifying medical information in your report.
After using this page, do you understand what to do next?
Anonymous — we only record the answer, never who gave it.