For women at average risk, the current standard recommendation is a mammogram every two years, starting at age 40 and continuing through age 74. That guidance comes from the U.S. Preventive Services Task Force, which updated its recommendation in 2024 to lower the starting age from 50 to 40. Beyond that baseline, your ideal schedule depends on your breast density, personal risk factors, and age.
The Standard Schedule for Average-Risk Women
The USPSTF recommends biennial (every two years) screening mammography for all women aged 40 to 74. This replaced earlier guidance that left the decision to start screening in your 40s up to individual choice. The shift reflects evidence that starting at 40 catches more cancers early, particularly in Black women, who are more likely to develop aggressive breast cancers at younger ages.
Every-other-year screening strikes a balance between catching cancers early and limiting the downsides of frequent testing. Over a 10-year period, annual screening starting at age 40 leads to a false-positive result about 61% of the time, meaning you’d likely be called back for additional imaging that turns out to be nothing. With biennial screening, that drops to about 42%. Unnecessary biopsies also fall, from roughly 7% to 5% over the same period.
Medicare covers a screening mammogram once every 12 months for enrollees, regardless of age. So if you’re on Medicare and prefer annual screening, insurance will pay for it.
When Annual Screening Makes More Sense
Not everyone fits the “average risk” category. If your lifetime risk of breast cancer is 20% or higher based on a formal risk assessment, or if you carry a BRCA1 or BRCA2 gene mutation, major radiology organizations recommend annual mammograms. The American College of Radiology also recommends annual breast MRI for these high-risk women, starting as early as age 25 to 30 depending on the specific risk factor.
You may fall into the higher-risk category if you:
- Have a known genetic mutation like BRCA1, BRCA2, or other hereditary syndromes linked to breast cancer
- Received chest radiation between ages 10 and 30, such as treatment for Hodgkin lymphoma
- Have a strong family history with multiple first-degree relatives diagnosed with breast cancer
For women with genetic mutations who are getting annual MRI, mammographic screening can sometimes be delayed until age 40, since MRI is more sensitive at detecting early cancers. Your doctor can help you figure out when to add mammography to your MRI schedule.
How Dense Breasts Affect Your Plan
Breast density doesn’t change how often you need a mammogram, but it may mean a mammogram alone isn’t enough. Dense breast tissue appears white on a mammogram, and so do tumors, which makes cancers harder to spot. About half of women over 40 have dense or extremely dense breasts.
For women with dense breasts, supplemental screening with ultrasound after mammography has been widely studied and can catch cancers that mammograms miss. A newer type of mammogram called tomosynthesis (sometimes marketed as 3D mammography) improves cancer detection in women with moderately dense breasts, though it’s less effective in the most extremely dense tissue. Molecular breast imaging is another option being offered at some centers on a biennial basis for women with dense breasts.
If you’re told you have dense breasts on your mammogram report, it’s worth asking whether supplemental imaging would be useful for you. Most states now require that mammography facilities notify you if your breasts are dense.
When to Stop Screening
This question has no single answer, and the major medical groups disagree. The USPSTF says routine screening should stop after age 74, largely because there isn’t strong research on the benefits of mammography past that age. The American Cancer Society takes a different approach: keep screening as long as you’re in good health and expected to live another 10 years or more. The American College of Radiology doesn’t set a firm cutoff at all, recommending individualized decisions instead.
The practical takeaway: if you’re over 74 and still active and healthy, screening can still be worthwhile. If you have serious health conditions that limit your life expectancy, the potential harms of screening, like false alarms and unnecessary biopsies, may outweigh the benefits.
Diagnostic Mammograms Follow a Different Schedule
Everything above applies to screening mammograms, the routine ones you get when you have no symptoms. Diagnostic mammograms are a different category entirely. If you’ve had an abnormal finding, a breast lump, or a personal history of breast cancer, your doctor may order diagnostic mammograms more frequently than once a year, as often as the situation requires. Medicare and most insurers cover diagnostic mammograms whenever they’re medically necessary, with no frequency limit.
How the U.S. Compares Globally
If biennial screening feels infrequent, it helps to know that some countries screen even less often. The NHS in England invites women for their first breast screening between ages 50 and 53, then every three years until age 71. After 71, women can still request screening every three years but are no longer automatically invited. The U.S. approach of starting at 40 with every-two-year screening is more aggressive than most national programs worldwide.
What About Men?
Routine mammogram screening is not recommended for men, even those at elevated risk. Male breast cancer is rare, accounting for about 1% of all breast cancer cases. Men with a strong family history or known BRCA mutations should be aware of the possibility and report any breast lumps promptly, but screening mammograms and ultrasounds are typically only performed in men after a lump has already been found. The evidence base for screening men before symptoms appear simply doesn’t exist yet.