One of the most common questions women ask is when they should get a mammogram, and how often. The answer depends on your age and your personal breast cancer risk. Mammograms are the most effective tool we have to find breast cancer early, often years before a lump can be felt, and finding it early is what makes treatment most successful. October is Breast Cancer Awareness Month, which makes it a good moment to get clear on the guidelines. Below are the current recommendations from the major medical organizations, plus the factors that may mean you should start earlier or screen more often.
Mammogram guidelines for women at average risk
For women at average breast cancer risk, the guidelines agree on starting at 40 but differ on frequency. The American College of Radiology, the Society of Breast Imaging, and the National Comprehensive Cancer Network recommend a yearly mammogram starting at age 40. The American Cancer Society says women ages 40 to 44 have the option to start annual screening, recommends yearly mammograms for women ages 45 to 54, and says women 55 and older can continue yearly or move to every other year. The U.S. Preventive Services Task Force recommends a screening mammogram every two years for women aged 40 to 74.
In short:
- Ages 40 to 44: yearly screening is recommended by the ACR, SBI, and NCCN, and is an option under the American Cancer Society.
- Ages 45 to 54: yearly mammograms, per the American Cancer Society.
- Ages 55 and older: continue yearly or switch to every other year; the USPSTF recommends every two years through age 74.
- Age 75 and older: an individual decision based on your overall health.
The differences come down to how each group weighs catching fast-growing cancers earlier against the chance of a false positive. Some experts favor annual screening to catch cancers sooner, while others point to added cost and callbacks. The common ground is clear: regular screening should begin at 40.
Know your risk by age 25
Experts now advise that every woman have a formal breast cancer risk assessment by age 25, well before screening typically begins. This is especially important for Black women, who are more likely to develop aggressive breast cancers and to be diagnosed younger, and for women of Ashkenazi Jewish descent, who have a higher chance of carrying a BRCA gene mutation. A risk assessment with your primary care provider or gynecologist determines whether you are average or higher risk, which in turn sets when your screening should start.
When screening should start earlier: higher-risk women
Women at higher than average risk often start screening around age 30, or even earlier. Women with a strong family history frequently begin at age 30, and women who had a first-degree relative, such as a mother or sister, diagnosed at a young age are generally advised to begin about 10 years before the age at which that relative was diagnosed. For example, if your mother was diagnosed at 40, your care team may recommend starting at 30.
Other factors that raise your risk include carrying a BRCA1 or BRCA2 gene mutation, having a personal history of breast cancer, or having had chest radiation therapy at a young age. For women at high risk, screening typically combines annual mammograms with a yearly breast MRI, with MRI often starting between ages 25 and 35 depending on the specific risk factor. The two tests are frequently scheduled about six months apart so that some form of imaging happens roughly every six months. If breast cancer runs in your family, genetic testing and a formal risk assessment can help clarify your personal risk and the right screening plan.
Dense breast tissue and your screening plan
Nearly half of women aged 40 and over have dense breast tissue, which makes mammogram images harder to interpret and is itself a risk factor for breast cancer. Dense tissue appears white on a mammogram, and so do many tumors, which means cancer can be harder to spot in dense breasts. Women with dense breasts may benefit from a conversation about additional imaging, such as breast ultrasound or breast MRI, alongside their mammogram. North Carolina law, along with a nationwide FDA requirement, means patients with dense breast tissue must be notified, so your results letter will note your breast density. If you learn you have dense breasts, ask your provider whether supplemental screening makes sense for you.
Mammogram guidelines for transgender and nonbinary people
Screening recommendations depend on hormone use, surgical history, and personal risk.
For transfeminine patients, the American College of Radiology considers screening mammography appropriate beginning at age 40 for those who have been on feminizing hormone therapy for five years or longer. For patients with less than five years of hormone therapy, or no hormone use, routine screening is generally not recommended at average risk. Patients at higher risk may be advised to begin earlier, typically between ages 25 and 30.
For transmasculine patients who have not had chest masculinization surgery, regular screening mammograms are recommended following the same age and risk guidelines that apply to other patients. After bilateral mastectomy (top surgery), routine screening mammography is generally no longer recommended.
Because these recommendations depend heavily on individual history, working with a care team experienced in gender-affirming care helps make sure you get the right exam at the right time. Insurance coverage can vary, so it’s worth confirming your benefits with your plan ahead of your appointment.
Screening after breast cancer surgery
If you have had breast cancer, your screening plan changes. After a double mastectomy, mammograms are usually no longer needed. After a single mastectomy, the remaining breast still needs regular mammograms. After a lumpectomy, annual screening mammograms are generally recommended. Your oncology team will set the exact plan for you.
What about after age 74?
Screening does not automatically stop at 74. The American Cancer Society advises that screening should continue as long as a woman is in good health and would still want to pursue treatment if cancer were found, and the American College of Radiology supports continued screening beyond age 74 when it remains meaningful for the patient. The USPSTF guidelines extend through age 74 simply because there is less study data beyond that age, not because screening should end. The takeaway: being healthy at 74 is not a reason to stop. This is a personal decision to make with your doctor based on your health and your wishes.
Common questions about mammogram timing
Can I start annual mammograms at 40 even if I am average risk? Yes. Several major societies recommend it, and the American Cancer Society gives women ages 40 to 44 that option.
How often should I get a mammogram if I have dense breasts? Follow the standard schedule for your age, but talk with your provider about whether to add ultrasound or MRI.
How often should I be screened after breast cancer? Women with a personal history of breast cancer need regular, often annual, imaging. Your oncology team will set the schedule.
Are mammograms covered by insurance?
Screening mammograms for average-risk women aged 40 and older are generally covered at no cost under the Affordable Care Act, and insurance regulations in North Carolina typically cover screening mammograms for women aged 40 and older. If you need additional imaging because of dense breasts or higher risk, check with your insurance provider to confirm your specific coverage.
Schedule your mammogram in the Triangle
A screening mammogram does not require a physician order for most women at average risk, so you can book your annual mammogram directly with our team. If you have a family history of breast cancer or other risk factors, talk with your doctor about whether you should start earlier or add imaging such as breast MRI.
To schedule, visit raleighrad.com/schedule or call 919-781-1437. Raleigh Radiology offers mammography at convenient locations across the Triangle area.