At What Age Should Women Get a Mammogram?

What do the current guidelines recommend?

The U.S. Preventive Services Task Force (USPSTF) updated its breast cancer screening recommendation in 2024, advising that women at average risk begin mammography at age 40 and continue every two years through age 74 1Ref 1Nicholson WK, Silverstein M, Wong JB, et al. (US Preventive Services Task Force) (2024).Screening for Breast Cancer: US Preventive Services Task Force Recommendation Statement.2024 USPSTF recommendation for biennial mammography starting at age 40 for average-risk women; discussion of high-risk indications; evidence for earlier start versus 2016 guidance. This was a notable shift from the 2016 USPSTF guidance, which listed 50 as the recommended start for most women and described the 40–49 range as a shared decision.

The American Cancer Society has long recommended annual screening starting at 40 2Ref 2American Cancer Society (2024).Breast Cancer Screening Guidelines — American Cancer Society.American Cancer Society recommends annual screening mammography starting at age 40 for average-risk women; women should have the choice to start annual screening between ages 40 and 44; annual screening strongly recommended from 45 to 54, then may switch to every 2 years. Women aged 40 to 44 should have the choice to start; annual screening is strongly recommended from age 45 to 54; thereafter women may transition to screening every two years if they prefer.

The main remaining difference between major organizations is frequency (USPSTF recommends every two years; ACS recommends annual from 45 onward), not starting age.

Women age 75 and older: Evidence for benefit in this group is less clear. Discussions about continuing or stopping screening in older women should take into account overall health status and life expectancy.

Annual versus every two years — which is right?

The USPSTF recommends mammography every two years for average-risk women 1Ref 1Nicholson WK, Silverstein M, Wong JB, et al. (US Preventive Services Task Force) (2024).Screening for Breast Cancer: US Preventive Services Task Force Recommendation Statement.2024 USPSTF recommendation for biennial mammography starting at age 40 for average-risk women; discussion of high-risk indications; evidence for earlier start versus 2016 guidance. The American Cancer Society supports annual screening from ages 45 to 54 2Ref 2American Cancer Society (2024).Breast Cancer Screening Guidelines — American Cancer Society.American Cancer Society recommends annual screening mammography starting at age 40 for average-risk women; women should have the choice to start annual screening between ages 40 and 44; annual screening strongly recommended from 45 to 54, then may switch to every 2 years. Both frequencies detect breast cancer — annual screening tends to find cancers at an earlier stage but also results in more callbacks and benign biopsies. There is no universally correct interval; it is a decision made with your clinician based on your preferences, breast density, and individual risk factors.

Who needs to start earlier or use additional imaging?

Some women need to start screening before age 40 or add supplemental imaging 1Ref 1Nicholson WK, Silverstein M, Wong JB, et al. (US Preventive Services Task Force) (2024).Screening for Breast Cancer: US Preventive Services Task Force Recommendation Statement.2024 USPSTF recommendation for biennial mammography starting at age 40 for average-risk women; discussion of high-risk indications; evidence for earlier start versus 2016 guidance2Ref 2American Cancer Society (2024).Breast Cancer Screening Guidelines — American Cancer Society.American Cancer Society recommends annual screening mammography starting at age 40 for average-risk women; women should have the choice to start annual screening between ages 40 and 44; annual screening strongly recommended from 45 to 54, then may switch to every 2 years:

BRCA1 or BRCA2 mutation carriers — typically recommended to begin both screening MRI and mammography in their late 20s or early 30s; exact timing is guided by a genetic counselor and breast imaging specialist.

Strong family history — a first-degree relative (mother, sister, or daughter) diagnosed with breast cancer, especially before menopause, increases your risk. Validated risk calculators can estimate your lifetime risk and determine whether high-risk protocols apply.

Dense breast tissue — all U.S. states now require mammography facilities to notify women if their breast tissue is dense. Dense tissue can obscure cancers on mammography and may warrant supplemental ultrasound or MRI depending on overall risk.

Prior chest radiation — women who received chest radiation (for example, for Hodgkin lymphoma) typically begin intensive screening 8–10 years after radiation.

Prior biopsy showing atypical hyperplasia or LCIS — these findings indicate elevated lifetime risk and generally warrant more frequent or intensive screening.

What does a mammogram actually look for?

A screening mammogram uses low-dose X-rays to create images of breast tissue. Radiologists look for masses, calcifications (tiny calcium deposits), and structural distortions that may warrant further evaluation. A callback — a request to return for additional images — does not mean cancer was found. Most callbacks lead to additional imaging that shows no cancer.

3D mammography (tomosynthesis) is now widely available and reduces callback rates compared to standard 2D mammography while maintaining cancer detection sensitivity.

How do race, ethnicity, and access affect mammography decisions?

Black women are diagnosed with breast cancer at younger ages on average and have higher mortality rates than white women — making early and consistent screening particularly important for this group 3Ref 3American Cancer Society (2024).Breast Cancer Death Rates Are Highest for Black Women — Breast Cancer Facts & Figures 2022–2024.Black women have a 40% higher breast cancer death rate than white women and twice the mortality rate among women under 50, despite a lower incidence rate, supporting the importance of early and consistent screening starting at age 40 for this group. Some organizations have highlighted this disparity as a key reason that starting at 40 is especially relevant for Black women.

Most ACA-compliant insurance plans cover preventive mammograms at no cost-sharing. The National Breast and Cervical Cancer Early Detection Program (funded by the CDC) provides free or low-cost screening for women who are uninsured or underinsured.

How do you get started if you have not had a mammogram yet?

If you are 40 or older and have not had a mammogram, the first step is a conversation with your primary care clinician. They can order the screening, discuss your personal risk level, help you decide on frequency, and determine whether additional imaging is appropriate given your history.