Breast cancer is far more common in women, but men also have a small amount of breast tissue and can develop breast cancer. Male breast cancer is rare, but the assumption that it “cannot happen to men” can cause some men to ignore a lump or nipple change longer than they should. [1]
The most common warning sign is a new breast lump or thickening, often under or close to the nipple. Other possible signs include nipple or skin changes, nipple discharge and swelling in the underarm area. [2]
Yes.
Everyone is born with some breast tissue. Men typically develop much less breast tissue than women, but the ducts and cells that remain can still develop cancer. [1]
Male breast cancer remains uncommon, but rare does not mean impossible.
One challenge is that many men do not realise they can develop breast cancer. They may assume a lump is caused by fat, muscle, infection or gynecomastia and delay seeking medical attention. [3]
The most common symptom is a new breast lump or thickened area. It is often firm and painless, although not always, and frequently occurs under or near the nipple or areola. [2]
Other possible signs include:
None of these findings proves that cancer is present, but a new or persistent change should be evaluated. [2]
This is an important distinction because gynecomastia is much more common than male breast cancer.
Gynecomastia is an increase in glandular breast tissue in boys or men, often related to changes in the balance between estrogen and testosterone. It may affect one or both breasts and can cause tenderness or discomfort. [4]
However, not every lump around the nipple can be diagnosed as gynecomastia based on touch alone.
| Finding | What it may suggest | What matters |
|---|---|---|
| Diffuse tissue behind the nipple | Can occur with gynecomastia. | A new or unusual change may still need evaluation. |
| Tenderness or pain | Common with gynecomastia. | Pain does not rule out cancer. |
| A discrete firm lump | Can have benign or malignant causes. | It should be examined rather than self-diagnosed. |
| New nipple inversion | Can be a concerning breast change. | Especially when new and one-sided. |
| Nipple discharge | Has several possible causes. | New discharge, particularly if bloody, should be assessed. |
| Skin dimpling | Not typical of simple gynecomastia. | Needs medical evaluation. |
No.
Male breast cancer lumps are often painless, but not always. Gynecomastia, on the other hand, can cause tenderness or pain. [2] [4]
Pain therefore cannot be used as a home diagnostic test. A persistent new lump should be assessed based on the overall clinical picture rather than whether it hurts.
Male breast cancer can occur at any age, although the risk increases with age and most cases are diagnosed in older men. [1]
A younger age therefore does not make breast cancer impossible. A man in his 30s or 40s should not ignore a persistent new breast lump simply because he considers himself too young for the disease.
Risk factors include:
BRCA1 and BRCA2 help repair DNA damage. Certain inherited changes in these genes can increase the risk of several cancers, including breast cancer in men.
Inherited BRCA2 variants are an important risk factor for male breast cancer. [5]
Genetic counselling and testing may be particularly relevant when:
The American Cancer Society advises men with breast cancer, a strong cancer family history or a known inherited mutation in the family to consider genetic counselling and testing. [3]
Not routinely for most men.
The National Cancer Institute states that screening mammography is not usually recommended for men, including many who have increased breast cancer risk. High-risk surveillance should instead be individualized according to family history, inherited risk and medical assessment. [5]
A man who develops a breast lump is in a different situation. Imaging performed because of a symptom is diagnostic evaluation, not routine screening.
Evaluation generally begins with medical history and examination of the breast, nipple and underarm area.
When further assessment is needed, tests may include:
Mammography can be performed in men when there is a breast symptom that needs evaluation. It can help assess masses, breast tissue and suspicious calcifications.
Ultrasound can help characterize an abnormality and can also guide a needle biopsy when needed.
If imaging identifies a suspicious area, a biopsy provides tissue for laboratory analysis and determines whether cancer cells are present. [6]
Being advised to have a biopsy does not itself confirm cancer; the tissue result provides the diagnosis.
If cancer is found, the tissue can be tested for:
These findings, together with the cancer stage, help guide treatment. Most breast cancers in men are hormone-receptor positive. [3]
Cancer arising from the breast ducts is the most common form of male breast cancer, and invasive ductal carcinoma is a major type. [1]
Lobular carcinoma is less common because male breasts generally contain far fewer lobules.
Other rare types can include Paget disease of the nipple and inflammatory breast cancer. [5]
The overall treatment principles are largely similar to those used for breast cancer in women, with adjustments based on the individual patient. Because male breast cancer is uncommon, much of the evidence and treatment approach comes from broader breast cancer research. [7]
Treatment may include:
Treatment is not chosen simply because the patient is male. Stage, ER and PR status, HER2 status, tumour grade, overall health and other tumour characteristics all influence the plan. [7]
Seek medical evaluation for a new or persistent change such as:
There is no need to wait for a lump to become painful or large. Male breast cancer lumps are often painless when discovered. [2]
No. Benign causes, particularly gynecomastia, are much more common. A new, firm or unusual lump should still be evaluated to determine its cause.
Gynecomastia itself is not breast cancer. However, a new lump should not automatically be assumed to be gynecomastia, particularly when it is firm, asymmetric or associated with nipple or skin changes.
Breast pain in men has many possible causes and is often benign. Pain neither confirms nor rules out cancer. A persistent painful area accompanied by a lump or another new change should be assessed.
No. Some cases are associated with inherited genetic changes, particularly BRCA2, but not every male breast cancer is hereditary.
Yes. Family history increases risk but is not required for the disease to occur.
There is no general recommendation for all men to follow a formal monthly self-examination programme. The practical goal is to be familiar with your usual chest and breast area and seek assessment for a new change. Men at increased inherited risk need individualized medical advice.
Yes. Mammography can be used diagnostically in men when needed. This is different from routine mammography screening for men without symptoms.
Male breast cancer is rare, but it does occur. The most common warning sign is a new breast lump, often under or near the nipple.
At the same time, a breast enlargement or lump in a man does not automatically mean cancer; gynecomastia and other benign causes are much more common.
Pain or touch alone cannot reliably distinguish them. A new firm lump, nipple inversion or discharge, skin changes or underarm swelling should be medically evaluated.
Routine mammography is not recommended for most men, but symptoms require diagnostic assessment that may include mammography, ultrasound and biopsy when appropriate.
Family history and inherited BRCA variants—particularly BRCA2—are also important risk factors and may make genetic counselling relevant for the patient and family.