How often should you have a mammogram?

What is a mammogram and how does mammography work?

A mammogram is an x-ray image of each breast, taken at a mammography center (UK: a screening unit or mobile unit). Mammogram and mammography describe the same test: mammography is the name of the technique, and a mammogram is the picture it produces.

There are two kinds. A screening mammogram is for women with no symptoms, and its aim is to find cancer early. A diagnostic mammogram is used when there is a lump, a change or an unclear screening result, and it takes pictures from more angles.

In the UK the same test is called breast screening and is run by the NHS Breast Screening Programme, which invites women as they become eligible. A primary care provider in the US is a GP in the UK.

Does mammogram screening work, and what does the evidence show?

The strongest support is for routine screening mammograms between 40 and 74. The US Preventive Services Task Force gave screening every 2 years in that age range a grade B recommendation in 2024 (UK: the NHS program screens every 3 years from 50 to 71). That recommendation is the basis for the US figures on this page, and the CDC summarizes the same schedule for the public.

The American Cancer Society (2026) also supports routine screening, on a timetable of its own, and the two differ most at the start. At 40 to 44 the ACS describes yearly screening as an option a woman can choose, not a set recommendation. From 45 to 54 it recommends a mammogram every year. From 55 it supports either yearly screening or every other year, for as long as a woman is in good health with at least 10 years of life expectancy.

Screening has downsides too, and the guidelines weigh them alongside the benefit of finding cancer early. The CDC lists pain during the test and exposure to repeated x-rays as potential harms. Knowing about these ahead of time can make the decision feel calmer, and both are picked up in the questions further down.

A mammogram does not find every cancer. The NCI notes that some cancers are missed, particularly in dense breasts.

Some women are asked to come back for more pictures after a screen. In the US this is a callback, and in the UK it is a recall to assessment. The NCI states that most people called back are not found to have cancer.

How much and how often should you have a mammogram?

The USPSTF (2024) schedule is a mammogram every 2 years from 40, continuing to 74 (UK: every 3 years from 50 to 71). It gives the same interval for perimenopause, menopause and postmenopause, so the rhythm does not change as you move through those years. A note of when the next one is due is a simple way to keep track.

The ACS timetable asks for more frequent screening in some years, yearly in place of every 2 years. Which of the two fits is a good conversation to have with your primary care provider, who can set it against your own history.

In the UK, the NHS sends a first invitation between the ages of 50 and 53 and repeats it until the 71st birthday. After that, automatic invitations stop, and screening stays available every 3 years by asking your local breast screening service.

For questions about family history and inherited risk, our page on breast cancer genetic screening is a good place to start.

What have the studies and guidelines shown, and what is still unclear?

The 2024 USPSTF review left two questions open, and for both it found the evidence insufficient. That wording describes the state of the research: the studies do not yet show clearly whether the benefits outweigh the harms. It is not a recommendation for or against.

The first open question is screening from 75 onward. With no clear answer from the studies, the decision at those ages rests on individual judgment with your doctor, and screening does not stop being available.

The second is extra imaging for dense breasts. For women with dense breasts and a normal mammogram, the USPSTF could not say whether an added ultrasound or MRI helps. Women in that position are encouraged to talk through the options with their doctor, and the finding is not advice against extra imaging.

A screening mammogram is designed for women without symptoms, so a clear result speaks only for the day it was taken. The guidance beside the schedule is to report any breast changes between screens, at any age (USPSTF, 2024), however recent your last result was.

Next steps

A good place to start is finding out when your next mammogram is due under the schedule you follow, and booking it if the date has arrived. If you have noticed a new breast lump or any breast change, or symptoms that are getting worse, it is worth seeing your doctor (UK: GP) promptly instead of waiting for the next screen. If you are nearing the upper end of the schedule, or have been told you have dense breasts, asking what the options are for you is a reasonable next conversation. The guidelines differ between countries and between organizations, and your own history and preferences matter too, so what suits you is your decision: not one size fits all.