Mammogram (Mammography (breast X-ray))
A low-dose breast X-ray used to screen for breast cancer before it can be felt, or to investigate a breast symptom or change.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- A mammogram is a low-dose breast X-ray used to screen for breast cancer early or to investigate a breast symptom.
- Screening saves lives by finding cancers early, but it has real limits: some cancers are missed, some are found between screens, and recall for a normal result (false positives) is common.
- Screening can also find cancers that would never have caused harm (overdiagnosis), leading to treatment that was not needed — estimates of how often this happens vary.
- The NHS invites women from age 50 every 3 years — up to their 71st birthday in England, up to their 70th birthday in Wales, and to age 70 in Scotland and Northern Ireland; screening is a personal, informed choice, and you can ask about benefits and harms.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your radiologist will give you advice for your situation.
Can find breast cancer early, before it can be seen or felt.
As the sole test for a clear breast symptom in a younger person, where ultrasound is often more useful and full assessment is needed.
Each breast is briefly compressed for a few seconds per image. This can be uncomfortable or briefly painful but passes quickly.
Clear information on benefits and harms before you decide to be screened.
Each breast is briefly compressed for a few seconds per image. This can be uncomfortable or briefly painful but...
You can dress and carry on with your day immediately. Any tenderness usually settles soon.
You usually receive a letter within about two weeks. Most people get a normal result and are recalled at their...
You are invited to an assessment clinic for more images, an ultrasound and sometimes a biopsy. Most people...
What is a mammogram?
A mammogram is an X-ray of the breast. It uses a low dose of radiation to look for changes that may be too small to see or feel, including early breast cancers. There are two main reasons for a mammogram: routine screening in people with no symptoms, and diagnostic mammograms to investigate a symptom such as a lump or change.
In England, the NHS Breast Screening Programme invites women (and others registered with a GP as female) aged 50 up to their 71st birthday for screening, usually every three years. The aim is to find breast cancers early, when treatment is more likely to be successful and less likely to need a breast to be removed.
Screening saves lives, but it has real limits and is a personal choice. Mammograms do not find every cancer (some are missed, and some appear between screens — 'interval cancers'). They can also lead to recall for tests that turn out normal (false positives), and to finding some cancers that would never have caused harm in a person's lifetime (overdiagnosis), leading to treatment that was not needed. Being clear about these trade-offs is part of making an informed decision.
The radiation dose from a mammogram is low. The benefit of finding cancer early is weighed against this small dose and the other limits above.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Screening versus diagnostic mammogram
| Point | Screening | Diagnostic |
|---|---|---|
| Who it is for | No symptoms | A symptom or recall |
| Why | Find cancer early | Investigate a change |
| Often combined with | Usually X-ray only | Ultrasound and sometimes biopsy |
| Results | Letter, ~2 weeks | Often the same clinic visit |
If you have a new breast symptom, do not wait for routine screening — see your GP, who can arrange the right assessment.
Preparing for your scan
- For NHS screening, you will be invited by letter; you can rebook if the time does not suit.
- If you have a new breast symptom such as a lump, see your GP rather than waiting for routine screening.
- On the day, avoid using talcum powder, deodorant or cream on your breasts or underarms, as these can affect the images.
- Wear a two-piece outfit, as you will need to undress from the waist up.
- Tell staff if you are, or might be, pregnant or are breastfeeding, or if you have breast implants.
- Mention any previous breast problems, surgery or family history of breast cancer.
- Ask any questions about why screening is offered and what the result might mean.
What happens
A mammogram is taken by a specialist radiographer (a mammographer), usually a woman. You undress from the waist up and stand at the machine. One breast at a time is placed on a flat plate, and a second plate presses down to flatten it for a few seconds while the X-ray is taken. Usually two views are taken of each breast.
The pressure can feel uncomfortable or briefly painful, but it only lasts seconds and helps get a clear, lower-dose image. The whole appointment is short. For a diagnostic clinic, you may also have an ultrasound and, if needed, a biopsy at the same visit.
Screening images are reviewed later by specialists, and you receive your result by letter, usually within about two weeks. In a symptomatic clinic, results are often discussed with you the same day.
Is this scan right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- As the sole test for a clear breast symptom in a younger person, where ultrasound is often more useful and full assessment is needed.
- When a new symptom needs prompt clinical assessment rather than waiting for routine screening.
- Very dense breasts, where mammography is less sensitive and additional imaging may be advised.
- Pregnancy, where screening is usually deferred unless there is a clear clinical need.
Delay or rearrange if…
- You are or might be pregnant, unless there is a clear clinical reason to proceed.
- You are breastfeeding, where timing and interpretation may need adjusting.
- You have a current breast infection or recent breast surgery, which can affect images.
- You have a new symptom that needs urgent assessment first rather than routine screening.
Alternatives to discuss
- Breast ultrasound, which uses no radiation, often used for symptoms or dense breasts.
- Breast MRI for higher-risk groups or specific situations.
- Clinical breast examination as part of assessment.
- Choosing not to attend screening after weighing the benefits and harms.
- Tailored, higher-frequency surveillance for those at high risk, arranged through specialist services.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Benefits
- Can find breast cancer early, before it can be seen or felt.
- Early detection makes successful treatment more likely.
- Can mean less extensive treatment, including less chance of needing a breast removed.
- A normal result, in context, can be reassuring.
- For symptoms, helps reach a diagnosis quickly as part of full assessment.
- Across the population, screening reduces deaths from breast cancer.
Risks & complications
- Discomfort or brief pain from the breast being compressed.
- Recall for further tests after screening that turn out to be normal (a false positive), which can cause anxiety.
- Needing extra images or an ultrasound to clarify a finding.
- A cancer being missed by the mammogram, or appearing between screens (an interval cancer).
- Overdiagnosis — finding a cancer that would never have caused harm, leading to treatment that was not needed.
- A biopsy, if needed, can cause bruising or, rarely, infection.
- A very small increase in lifetime cancer risk from the radiation, which is outweighed for most people in the screening age range by the benefit.
- Significant anxiety or distress around recall or results.
Mammography is a balance of benefits and harms. It finds many cancers early and reduces deaths, but it misses some cancers, recalls many people who turn out not to have cancer, and finds some cancers that would never have caused harm (overdiagnosis), leading to unnecessary treatment. Estimates of how often overdiagnosis happens vary between studies. The radiation dose is low. Understanding these trade-offs helps you make an informed choice; your GP or the screening service can talk them through.
Published figures to discuss
Mammographic screening involves a genuine balance of benefits and harms, and published estimates vary depending on the method used. UK reviews indicate that screening reduces breast cancer deaths across the population, while also causing some recalls that turn out normal (false positives) and some overdiagnosis (cancers that would never have caused harm). The figures below are drawn from UK sources and are presented as cautious estimates, not guarantees; your individual benefit and risk depend on your age and personal risk.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Reduction in breast cancer deaths from screening | Around a 20% relative reduction in breast cancer mortality among those invited, in the UK independent review | Estimated to prevent roughly 1,300 breast cancer deaths a year in the UK; benefit varies with age and individual risk. | NHS — Benefits and risks of breast screeningnhs.ukPublished figure |
| Overdiagnosis | Estimates vary widely; the UK independent review estimated roughly 3 overdiagnosed cancers for every 1 breast cancer death prevented, while some later studies suggest less | Overdiagnosis means treatment that was not needed; the size of this harm is genuinely uncertain and debated. | NHS — Benefits and risks of breast screeningnhs.ukSource-linked context |
| Recall for further assessment after screening | A minority of screening mammograms | Most recalls do not turn out to be cancer, but recall is stressful and may lead to extra imaging or biopsy. | Guide sourcesClinical context |
| Cancer missed by mammography | Possible, higher in dense breasts and interval cancers | A new lump or nipple change needs assessment even after a recent normal mammogram. | Guide sourcesClinical context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
There is no physical recovery from a mammogram. Any discomfort from the compression settles quickly. The main 'wait' is for the result, which for screening usually comes by letter within about two weeks.
- Brief breast tenderness that settles quickly.
- Carrying on with normal activities straight away.
- Waiting up to about two weeks for a screening letter.
- Feeling anxious while awaiting results — common and understandable.
Aftercare
- Resume normal activities immediately; take simple pain relief if your breasts feel tender.
- Watch for your result letter and follow any instructions in it.
- If you are recalled, attend the assessment clinic — most people recalled do not have cancer.
- Keep checking your breasts and report any new changes to your GP, even soon after a normal mammogram.
- Do not rely on a normal mammogram to rule out a new lump or symptom — get any new change checked.
- Keep your next routine screening appointment when invited.
- Your invitation or appointment letter.
- No talcum powder, deodorant or cream on the day.
- A two-piece outfit for easy undressing.
- Staff told about pregnancy, breastfeeding or implants.
- A note of any breast symptoms or family history.
- Knowing how and when you will receive your result.
⚠ Get urgent help if…
- A new breast lump, or a lump in the armpit — see your GP promptly, even after a normal mammogram.
- Changes in breast shape or size, skin dimpling or puckering.
- Nipple changes, including a new pulled-in nipple, rash or discharge (especially bloodstained).
- Persistent breast pain that is new or unusual for you.
- After a biopsy: spreading redness, increasing pain, swelling or fever (signs of infection).
- Not receiving your screening result in the expected time — chase it up.
- Significant distress while awaiting results — ask for support.
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your radiologist gives you.
Results & realistic expectations
Most screening mammograms are normal, and you are simply invited back at your next routine screen. A normal result, in context, is reassuring but does not guarantee you do not have, or will not develop, breast cancer — some cancers are missed and some develop between screens. So you should still report any new breast change to your GP.
If something needs a closer look, you are recalled for assessment, which may include more images, an ultrasound and sometimes a biopsy. Being recalled does not mean you have cancer — most people who are recalled do not. For a diagnostic mammogram, the result is interpreted alongside examination and other tests to reach a diagnosis.
A mammogram reflects your breasts on the day it is taken, which is why screening is repeated (usually every three years in the NHS programme). A normal result does not last indefinitely, and breast cancer can develop between screens, so ongoing breast awareness between mammograms is important.
Related tests, treatments or support
In symptomatic or recall clinics, a mammogram is usually combined with a clinical examination and an ultrasound, and with a needle biopsy if needed — together known as 'triple assessment'. Ultrasound or MRI may be used in addition to mammography for some people, such as those with dense breasts or a high family risk.
Follow-up & long-term care
For screening, you receive a result letter, with recall to an assessment clinic if needed. For diagnostic mammograms, follow-up depends on the findings and may include further tests, specialist referral or a plan for treatment. Ask how and when you will get your result, and what the next step is if you are recalled or if a biopsy is taken.
- Attend routine screening when invited (usually every three years in the NHS programme).
- Stay breast aware between screens and report any new change to your GP.
- Discuss extra surveillance with your doctor if you have a strong family history or other higher risk.
- Keep your contact details up to date with your GP so invitations reach you.
Repeat, follow-on and what comes next
- Screening is repeated, usually every three years, so a normal result is not a one-off answer.
- Recall for further tests is common and usually turns out to be benign.
- Some cancers are missed or appear between screens (interval cancers).
- A biopsy is sometimes needed to clarify a finding.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- Clear information on benefits and harms before you decide to be screened.
- A reliable result letter and a defined recall pathway.
- Encouragement to stay breast aware and report new changes between screens.
- Prompt, supportive assessment if you are recalled, with clear explanations.
- Access to support for anxiety around recall, results or diagnosis.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- Whether you are screened through the free NHS programme or pay privately.
- Whether it is a screening mammogram or a fuller diagnostic assessment.
- Whether ultrasound, extra views or a biopsy are added.
- The reporting specialist's fee and how quickly results are given.
- The clinic or facility fee.
- Whether a follow-up consultation to discuss results is included.
- The mammogram fee and the reporting specialist's fee.
- Whether examination, ultrasound or biopsy are included if needed.
- How and when you will receive your results.
- Whether a consultation to discuss results is included.
- What happens, and any cost, if you are recalled or need further tests.
- The cancellation policy and what happens if a result is inconclusive.
On the NHS? The NHS offers free breast screening from age 50 across the UK, though the upper age and details differ by nation: England invites up to the 71st birthday, Scotland and Northern Ireland to age 70, and Wales up to the 70th birthday, each usually every three years, with older people able to self-refer or contact their local service. Diagnostic mammograms are arranged on the NHS when there is a symptom or recall; private mammograms are available but the NHS programme is the main route. A new breast symptom needs diagnostic assessment and should never wait for the next screening invitation.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Being offered screening without a clear explanation of both its benefits and its harms.
- Not being told that a normal result does not rule out all cancer.
- Not understanding overdiagnosis and the possibility of unnecessary treatment.
- Assuming screening is compulsory rather than an informed personal choice.
- No clear plan for who explains results and what recall means.
Marketing red flags
- Claims that a mammogram 'catches all breast cancers' or guarantees peace of mind.
- Promoting private screening without explaining its harms as well as benefits.
- Implying a normal result means you never need to check your breasts again.
- Pressuring people outside the recommended age range to pay for screening without a risk discussion.
- Downplaying recall rates, overdiagnosis or the limits of the test.
Choosing a specialist safely
- Check the radiologist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the radiologist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good radiologist will welcome every one of these.
- Given my age and risk, what are the benefits and harms of screening for me?
- What happens if I am recalled, and how likely is it to be cancer?
- How might dense breasts or my family history affect my screening?
- What does a normal result rule out, and what does it not?
- If I have a symptom, what assessment will I have and when?
- How and when will I get my results, and who explains them?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the radiologist who carries out my scan, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this scan not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Who is invited for NHS breast screening, and how often?
Does a normal mammogram mean I definitely do not have cancer?
What does it mean if I am recalled?
What is overdiagnosis, and why does it matter?
Does a mammogram hurt, and is the radiation safe?
I have a breast symptom — should I wait for screening?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: NHS — Breast screening (mammogram) NHS — Benefits and risks of breast screening GOV.UK — NHS Breast Screening Programme Independent UK Panel — The benefits and harms of breast cancer screening (Marmot review) Cancer Research UK — Breast screening Royal College of Radiologists — Benefits and risks of imaging (patient information) NHS — Breast screening: who breast screening is for NHS inform (Scotland) — Breast screening Public Health Wales — Breast screening (Breast Test Wales) nidirect (Northern Ireland) — Breast screening overview
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
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