Mammograms & Breast Cancer: What Every Woman Should Know
Posted on November 10, 2026 at 10:01 AM by Gabrielson Clinic
A Mammogram Can Find What You Cannot Feel
You may feel healthy. You may not notice a lump. You may have no breast changes at all.
That is exactly why mammograms are so important.
A mammogram can find breast cancer before symptoms begin and sometimes up to three years before a lump can be felt. Finding breast cancer earlier can give you more treatment options and improve the chances of successful treatment.
During Breast Cancer Awareness Month, take a few minutes to learn when mammograms are recommended, what the test involves, and how your personal breast cancer risk may affect your screening plan.
At The Gabrielson Clinic for Women, we want you to feel informed and confident about your breast health. Our women’s healthcare team is here to answer your questions, help you understand your breast cancer risk, and guide you on when screening may be right for you.
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What Is a Mammogram?
A mammogram is a low-dose X-ray that looks for signs of breast cancer before you may be able to see or feel them.
Most major medical organizations recommend that women at average risk start regular mammograms at age 40, though screening frequency recommendations vary. Your personal and family health history may mean you need a different screening plan.
During a mammogram, the technician gently compresses each breast between two plates for a few seconds to take the images. This spreads the breast tissue out so the radiologist can see it more clearly using a low dose of radiation.
Mammograms are used in two main ways:
Screening mammogram: Used when you do not have breast symptoms. The goal is to look for cancer before you notice a problem.
Diagnostic mammogram: Used when you have a breast symptom or when a screening mammogram finds something unusual. It takes additional images to get a closer look at a specific area.
Why Are Mammograms So Important?
Breast cancer does not always cause symptoms in its early stages.
A tumor may be growing before it becomes large enough to feel. Mammograms can detect some of these cancers earlier, giving women and their healthcare teams a chance to act sooner.
Regular screening can:
- Find breast cancer before symptoms appear
- Detect changes that are too small to feel
- Help identify cancer at an earlier stage
- Allow treatment to begin sooner
- Track changes in breast tissue over time
Research has consistently shown that mammography screening reduces the risk of dying from breast cancer.
Screening cannot prevent breast cancer, but it can help find it earlier.
When Should You Start Getting Mammograms?
For women at average risk, major medical organizations now agree on an important starting point: regular mammogram screening should begin by age 40.
The exact schedule varies slightly between organizations.
| Organization | General Mammogram Recommendation for Average-Risk Women |
|---|---|
| ACOG | Begin at age 40 and screen every 1 or 2 years based on a discussion with your provider |
| USPSTF | Mammogram every 2 years from ages 40 through 74 |
| American Cancer Society | Ages 40–44 may choose yearly screening; ages 45–54 yearly; age 55+ every 2 years or continue yearly |
The American College of Obstetricians and Gynecologists (ACOG) updated its guidance in 2024 to recommend that all average-risk women begin mammography at age 40. The U.S. Preventive Services Task Force (USPSTF) recommends screening every two years from ages 40 through 74. The American Cancer Society uses a slightly different schedule, including yearly screening from ages 45 through 54.
These guidelines are a starting point, not a replacement for personalized medical advice.
Your healthcare provider can help you decide how often you should have a mammogram based on your age, health history, breast density, family history, and other risk factors.
What Does “Average Risk” Mean?
You may hear screening guidelines refer to women who are at "average risk."
In general, this means you do not have certain factors that greatly increase your chance of developing breast cancer, such as:
- A personal history of breast cancer
- A strong family history of breast cancer
- Certain inherited gene changes, such as BRCA1 or BRCA2
- A history of high-dose radiation treatment to the chest at a young age
The American Cancer Society uses these factors when defining average breast cancer risk.
Your risk can also change over time, so it is worth reviewing your history with your healthcare provider.
What If Breast Cancer Runs in My Family?
Family history matters, but having a relative with breast cancer does not automatically mean you will develop it.
Tell your provider if a parent, sibling, child, grandparent, aunt, or other close relative has had breast or ovarian cancer, especially if the cancer developed at a younger age.
Your provider may want to know:
- Who in your family had cancer
- What type of cancer they had
- How old they were when diagnosed
- Whether anyone has had genetic testing
- Whether several relatives on the same side of the family have had breast or ovarian cancer
Women at higher risk may need to begin screening earlier or may benefit from additional tests, such as breast MRI. The American Cancer Society recommends annual MRI and mammography, usually starting around age 30, for certain women at high risk.
Are Mammograms Safe?
Yes. Mammograms use a small amount of radiation.
Radiation exposure is a common reason women worry about getting mammograms. Mammograms use a very low dose of X-ray radiation to screen breast tissue.
The American Cancer Society estimates that the radiation from a typical mammogram is similar to the amount of natural background radiation a person receives over about one to two months.
The reference research also shows that the expected benefit of finding breast cancer early is much greater than the small radiation risk associated with recommended mammography screening.
Do not skip a recommended mammogram simply because you are concerned about radiation. Talk with your healthcare provider if you have questions about your individual situation.
What Are Dense Breasts?
Breasts are made of fatty, glandular, and fibrous tissue. Breast tissue is considered dense when it contains more glandular and fibrous tissue than fatty tissue.
You cannot tell if you have dense breasts by how they look or feel. A mammogram determines breast density.
Dense breasts matter for two reasons:
- Dense tissue can make breast cancer harder to see on a mammogram.
- Having dense breasts is itself associated with a higher risk of developing breast cancer.
About half of U.S. women over age 40 have dense breast tissue.
Since September 2024, mammography facilities across the United States have been required to tell patients whether their breasts are dense.
If your mammogram report says you have dense breasts, do not panic. Ask your healthcare provider what that means for you and if your screening plan should change.
What Is a 3D Mammogram?
A traditional digital mammogram creates two-dimensional images of the breast.
A 3D mammogram, also called digital breast tomosynthesis, takes several images at different angles. A computer then creates thin image sections that a radiologist can review.
Both standard digital mammography and 3D mammography are effective options for breast cancer screening.
3D mammography can make some cancers easier to detect, especially in women with dense breasts. The best screening option depends on your health needs and the imaging services available to you.
What Happens During a Mammogram?
A mammogram usually takes only a short amount of time.
You will stand in front of the mammography machine while a technologist places one breast on a flat plate. Another plate will press the breast firmly for a few seconds while an X-ray image is taken.
The process is repeated at different angles and then on the other breast.
You will likely feel pressure. Some women find the compression uncomfortable, but it lasts only a short time.
The technologist checks the images for quality, but a radiologist reviews them and provides the final results.
What Happens After Your Mammogram?
A radiologist reviews the images and sends a report with the results.
Your report may say that the mammogram looks normal, that a finding appears benign, or that additional imaging is needed.
Being called back after a mammogram does not mean you have breast cancer.
Sometimes the radiologist simply needs:
- Another mammogram view
- A closer image of one area
- An ultrasound
- Previous mammograms for comparison
The American Cancer Society notes that callbacks after screening mammograms are common and often turn out not to be cancer.
Always complete recommended follow-up testing so your healthcare team can get the information they need.
Know What Is Normal for You
You do not need to perform a complicated breast self-exam on a strict schedule.
Instead, become familiar with how your breasts normally look and feel.
Contact your women's healthcare provider if you notice:
- A new lump in the breast or underarm
- Swelling or thickening
- Dimpling or irritation of the skin
- Red or flaky skin around the breast or nipple
- A nipple that begins pulling inward
- Nipple discharge that is not breast milk
- A change in breast size or shape
- New or persistent breast pain
These symptoms can have causes other than cancer, but they should still be evaluated.
Do not wait until your next routine mammogram if you notice a new change.
Mammograms Are Only One Part of Breast Health
Breast health isn’t just about remembering one appointment.
Your healthcare provider can help you look at the bigger picture, including:
- Your age
- Family history
- Personal medical history
- Breast density
- Previous mammogram results
- Genetic risk
- New breast symptoms
- Changes throughout different stages of life
Your screening plan should fit you, not just your age.
That is especially important if you have a strong family history of breast cancer, dense breasts, previous abnormal imaging, or another factor that may increase your risk.
Make Breast Health Part of Your Routine
Breast Cancer Awareness Month is a good reminder, but your breast health matters all year.
You do not need to wait until you find a lump to think about screening. Mammograms can find breast cancer before you know anything is wrong, and your women's healthcare provider can help you understand when and how often you should be screened.
At The Gabrielson Clinic for Women, we believe women should feel informed, supported, and comfortable asking questions about their health. Our team provides personalized women's healthcare across every stage of life.
