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Health condition · Clinically reviewed

Male breast cancer, rare, often missed - and very treatable when caught.

A lump behind a man's nipple is rarely cancer - but when it is, low awareness means it's too often found late. Here's what actually matters.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against NICE, the Association of Breast Surgery and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects UK practice including triple assessment, BRCA2 testing and hormone therapy for men.

Key facts

Male breast cancer at a glance.

The essentials, in plain English - how rare it is, why it's often caught late, and what actually raises the risk.

  • How rare it is

    Fewer than 1 in 100 breast cancers occur in men - around 400 cases a year in the UK, but the number is rising slightly.

  • Why it gets missed

    Low awareness in men and clinicians means diagnosis is often delayed, so the disease can be more advanced at presentation.

  • Strongest genetic link

    A BRCA2 mutation carries a far stronger association than BRCA1 - and has implications for daughters and other relatives.

  • Typical first sign

    A painless lump behind or beside the nipple - unlike gynaecomastia, which tends to be a diffuse, central swelling.

  • Receptor status

    Most male breast cancers are oestrogen and progesterone receptor positive, which is why tamoxifen is the mainstay of treatment.

  • Surgical approach

    Mastectomy is more common than breast-conserving surgery in men, simply because there is less breast tissue to work with.

Why this guide matters

Rare doesn't mean ignorable.

Male breast cancer is uncommon, but the consequences of missing it are real. Three points shape everything else on this page.

  • Awareness is the real risk factor

    Because so few men expect a breast lump to be cancer, presentation is often delayed - and delay is what drives worse outcomes, not the biology itself.

  • It is not just older gynaecomastia

    Gynaecomastia is common and almost always benign, but a hard, off-centre, painless lump is different - and deserves proper assessment, not reassurance by assumption.

  • A diagnosis can carry a genetic message

    A BRCA2 finding is not only about the man in front of us - it changes the picture for daughters, sisters and other relatives too.

How the diagnosis is made

From a lump to a clear diagnosis.

The triple assessment pathway a specialist breast clinic will follow - the same one used for women, adapted to the male chest.

  1. 01

    Assessing

    Clinical breast examination

    A focused examination of the lump, the nipple and both axillae - looking for the features that distinguish cancer from gynaecomastia.

  2. 02

    Assessing

    Mammography and ultrasound

    Imaging of the breast and axilla, exactly as it would be for a woman - mammography works well even on the smaller volume of male breast tissue.

  3. 03

    Confirming

    Core needle biopsy

    Tissue sampling to confirm the diagnosis and establish receptor status - this completes the triple assessment pathway used across the NHS.

  4. 04

    Confirming

    Distinguishing from gynaecomastia

    A cancer is typically an eccentric, hard, subareolar mass; gynaecomastia is a concentric, rubbery enlargement of glandular tissue.

  5. 05

    Confirming

    Molecular and HER2 testing

    ER, PR and HER2 status are checked on the biopsy sample, alongside genetic counselling referral where BRCA2 is suspected.

  6. 06

    Planning

    Staging

    Staging investigations follow the same principles used in female breast cancer, guided by tumour size, nodal status and any signs of spread.

  7. 07

    Planning

    Specialist MDT review

    A breast cancer multidisciplinary team - working with clinical genetics where relevant - agrees the treatment plan.

Typical timeline: most of this pathway is completed within two to three weeks of referral.

Symptoms

What to actually look for.

A painless lump is the classic sign, but a handful of other features matter just as much - and one or two mean urgent review.

  • Painless retroareolar lump

    The most common presenting feature - a firm lump behind or just beside the nipple, usually found by the man himself.

  • Nipple retraction

    The nipple pulling inward or changing shape - a feature that should always prompt urgent assessment.

  • Nipple discharge

    Any discharge is worth checking, but blood-stained discharge is particularly concerning and needs prompt referral.

  • Skin changes

    Dimpling, tethering or ulceration of the skin over the lump - signs of local invasion.

  • Axillary lymphadenopathy

    A lump or swelling in the armpit alongside the breast lump - often present because diagnosis is frequently made later.

  • Later-stage presentation

    Because awareness is low and symptoms can be dismissed, male breast cancer is more often diagnosed at a later stage than in women.

  • A strong family or genetic pattern

    BRCA2 mutation, Klinefelter syndrome or a family history of breast or ovarian cancer all raise suspicion when a lump is found.

  • Red flag - any new lump in a man

    A painless subareolar lump in a man should never be assumed to be gynaecomastia without a proper assessment.

Treatment

How male breast cancer is treated in the UK.

Surgery first, hormone therapy for most - plus radiotherapy, chemotherapy and targeted treatment where the tumour needs it.

  • Mastectomy

    The most common surgery in men, given the limited volume of breast tissue - usually combined with sentinel lymph node biopsy.

  • Sentinel lymph node biopsy

    Checks whether cancer has spread to the axillary nodes, sparing many men a full axillary clearance. See our sentinel lymph node biopsy guide.

  • Post-mastectomy radiotherapy

    Used selectively - for larger tumours, close margins or node-positive disease - to reduce the chance of local recurrence.

  • Tamoxifen

    The mainstay of hormone therapy, since most male breast cancers are ER-positive - typically continued for several years.

  • Aromatase inhibitor with GnRH agonist

    Aromatase inhibitors alone are less effective in men and are usually combined with a GnRH agonist when tamoxifen is not tolerated.

  • Chemotherapy

    Offered for higher-risk or node-positive disease, following the same protocols used in female breast cancer.

  • HER2-targeted therapy

    Trastuzumab and related agents are used when the tumour is HER2-positive, alongside standard chemotherapy.

  • Genetic counselling and BRCA2 testing

    Offered to most men with breast cancer - results affect surveillance for the patient and risk assessment for daughters and other relatives. See our BRCA testing clinic.

Psychosocial support

Treatment isn't only physical.

Many men find the diagnosis itself disorientating, given how strongly breast cancer is associated with women. Good units build psychosocial support and peer contact into the plan from the start, not as an afterthought.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP or breast surgeon knows your history and can tell you which parts apply to you. If you find a lump, get seen rather than waiting to see.

  • NICE. Breast cancer: recognition and referral, and NG101 Familial breast cancer.

  • Association of Breast Surgery (ABS). Guidance on the management of male breast cancer.

  • Breast Cancer Now. Information and support for men with breast cancer.

  • MHRA and clinical genetics services. BRCA2 testing and cascade family testing guidance.

Red flags

When a lump needs urgent attention.

Most breast changes in men turn out to be gynaecomastia. These are the features that shouldn't be assumed away.

  • Painless subareolar lump

    The classic presenting sign - any firm, off-centre lump behind the nipple in a man needs urgent triple assessment, not reassurance alone.

  • Blood-stained nipple discharge

    Bloody discharge is far more concerning than clear or milky discharge and should be referred urgently.

  • Nipple retraction or skin tethering

    A change in the shape of the nipple or dimpling of the overlying skin points to local invasion and needs urgent imaging.

  • A lump in the armpit

    Axillary swelling alongside a breast lump suggests nodal spread and should be assessed as part of the same referral.

  • Known BRCA2 carrier with any breast symptom

    Men who carry a BRCA2 mutation have a lifetime risk of breast cancer well above the general male population and should have a low threshold for review.

  • Klinefelter syndrome with a breast lump

    Klinefelter syndrome significantly raises the risk of male breast cancer - any new lump deserves prompt assessment rather than being assumed to be gynaecomastia.

  • Rapidly growing or fixed lump

    A lump that is growing quickly, feels fixed to the chest wall, or is associated with skin ulceration needs same-day or urgent same-week referral.

Living with it

A rare diagnosis, but not one you carry alone.

Four things that help beyond the treatment plan itself - naming the stigma, thinking about family risk, finding support built for men, and staying with follow-up.

A quiet reminder

You're not the only man this has happened to.

It can feel isolating, but there is a growing community of men who've been through exactly this and are willing to talk about it.

  1. 01 Talk about it

    Naming the stigma helps

    Being diagnosed with what many still think of as a "women's disease" is disorientating - saying that out loud to your team is a reasonable first step.

  2. 02 Genetics

    Think beyond yourself

    A BRCA2 result matters for your children and siblings too - genetic counselling can help the whole family understand and plan around the risk.

  3. 03 Support

    You don't have to find this alone

    Breast Cancer Now and similar charities run support specifically for men, alongside the general breast cancer community.

  4. 04 Follow-up

    Surveillance continues after treatment

    Regular follow-up, and often extended tamoxifen, continues for years after primary treatment finishes - it is a marathon, not a single event.

Frequently asked

Everything we get asked about male breast cancer.

Quick answers on how common it is, how it differs from gynaecomastia, genetics and treatment.

  • What is male breast cancer?

    A rare cancer that develops in the small amount of breast tissue men have, most often just behind the nipple. It accounts for fewer than 1 in 100 breast cancers but is diagnosed in around 400 men a year in the UK.

  • How common is male breast cancer?

    It is rare - roughly 1% of all breast cancer cases occur in men. Because it is uncommon and awareness is low, diagnosis is often delayed compared with women, so it can present at a later stage.

  • How is male breast cancer different from gynaecomastia?

    Gynaecomastia is a benign, usually diffuse and symmetrical enlargement of glandular tissue, often driven by hormonal changes. Male breast cancer more typically presents as a firm, off-centre, painless lump behind or beside the nipple. Any doubt is resolved with triple assessment.

  • What raises the risk of male breast cancer?

    A BRCA2 mutation is the strongest known genetic risk factor, well ahead of BRCA1. Klinefelter syndrome, a family history of breast cancer, obesity, liver disease or cirrhosis, radiation exposure and older age all increase risk too.

  • How is male breast cancer diagnosed?

    The same triple assessment pathway used for women - clinical examination, mammography and ultrasound imaging, and a core needle biopsy. The biopsy also establishes hormone receptor and HER2 status.

  • How is male breast cancer treated?

    Mastectomy with sentinel lymph node biopsy is the most common surgery, sometimes followed by radiotherapy. Because most cases are hormone-receptor positive, tamoxifen is the mainstay of ongoing treatment, alongside chemotherapy or HER2-targeted therapy where the tumour needs it.

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