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Causes of breast cancer in men

Who is more likely to get breast cancer

Anyone can get breast cancer and it's not always clear what causes it.

In men, you might be more likely to get it if you:

  • are over 60
  • have other people in your family who've had breast or ovarian cancer – you may have inherited a faulty gene, such as a faulty BRCA gene
  • have had radiotherapy to your chest before
  • have had a condition that affected or damaged your testicles (such as undescended testicles, or mumps as an adult)
  • had surgery to remove one of both of your testicles
  • work in a hot environment like a steel works (this can damage your testicles, which can increase your risk of breast cancer)

You may also be more likely to get it if you have higher levels of the hormone oestrogen. This may be more likely if you:

  • have long-term damage to your liver, such as cirrhosis
  • have obesity or are overweight
  • have a condition called Klinefelter syndrome

Many breast cancers are also linked to lifestyle, such as smoking.

If you're trans or non-binary

If you're a trans man, trans woman or are non-binary, how likely you are to get breast cancer depends on if you've had surgery, and if you're taking hormones.

If you were assigned female at birth

If you were assigned female at birth and you've had top surgery (surgery to remove the breasts and have male chest reconstruction), you may be less likely to get breast cancer.

Removing the breasts may lower your chance of getting breast cancer compared to a cis-gendered women, though it may still be higher than a cis-gendered man.

If you've not had top surgery to remove the breasts and are between 50 and 71, you should be able to have breast screening (mammogram).

Breast Cancer UK has more information about being transgender and breast cancer risk

If you were assigned male at birth

If you were assigned male at birth, you may be more likely to get breast cancer if you've been taking feminising hormones for longer than 2 years.

These hormones may increase your chance of getting breast cancer compared to a cis-gendered man, though it may still be lower than that of a cis-gendered woman.

If you've been taking feminising hormones for longer than 2 years and are between 50 and 71, you should be able to have breast screening (mammogram).

Breast Cancer UK has more information about being transgender and breast cancer risk

How to reduce your risk of getting breast cancer

You cannot always prevent breast cancer, but there are things you can do to lower your chance of getting breast cancer.

Do

  • try to cut down on alcohol and avoid drinking more than 14 units a week

  • try to lose weight if you are overweight

  • try to quit smoking

Genetic testing for breast cancer risk

If any of your close relatives have had breast or ovarian cancer, you may be eligible for an NHS genetic test.

A genetic test will check to see if you have a faulty gene which increases your risk of getting cancer, such as a faulty BRCA gene.

Speak to a GP about genetic testing if breast or ovarian cancer run in your family.

The GP may ask about:

  • who and how many people in your family have had cancer
  • the type of cancer they had
  • how old they were when they were diagnosed
  • if your family member is available for genetic testing or has been tested before

The GP will refer you to a specialist breast clinic or genetics clinic for assessment if they think you are at increased risk.

You can also have NHS genetic testing for faulty BRCA genes if you're 18 years or older and have 1 or more Jewish grandparent.

Treatments if you're at increased risk

If you have a higher risk of getting breast cancer because you have a faulty gene, there are some treatments that can help reduce your risk.

A doctor or genetic counsellor will discuss your options with you and explain the benefits and possible side effects.

Treatments to reduce your risk include:

  • medicines
  • surgery to remove your breast tissue (mastectomy) – this may be offered if you are at very high risk

Page last reviewed: 24 March 2024
Next review due: 24 March 2027