Breast cancer in men most often appears as a firm, painless lump behind or near the nipple. Because men have a small amount of breast tissue concentrated behind the areola, changes there tend to be noticeable early, but many men don’t realize they can get breast cancer at all. About 2,800 men will be diagnosed in the United States in 2025, making up less than 1% of all breast cancer cases.
How the Lump Feels and Where It Shows Up
Roughly 75% of men with breast cancer first notice a hard, painless mass in one breast. The lump is typically firm rather than soft or spongy, and it usually sits directly behind the nipple or within the darker skin of the areola. In some cases the mass is off-center, extending into the upper outer part of the chest. A lump that feels cord-like and stretches from beneath the areola outward is another reported presentation.
Unlike the lumps women sometimes feel that shift around under the skin, a cancerous mass in a man’s breast tends to feel fixed in place. It’s almost always on one side only. Pain is uncommon at first, which is part of why men often wait weeks or months before getting checked.
Visible Skin Changes
Beyond the lump itself, the skin over the breast can change in ways you can see in a mirror. Common visible signs include:
- Dimpling or puckering: the skin pulls inward, creating a dent or crease that wasn’t there before.
- Orange-peel texture: the skin develops small ridges or pits that resemble the surface of an orange, a sign the cancer is affecting tissue just under the skin.
- Redness or flaking: a patch of irritated, scaly, or red skin on the breast, nipple, or areola that doesn’t heal.
- An open sore: in more advanced cases, the skin can break down into an ulcer that won’t close on its own.
These skin changes can develop with or without a noticeable lump. A persistent area of redness or scaling on one side of the chest that doesn’t respond to basic skin care is worth getting evaluated.
Nipple Changes and Discharge
The nipple itself can be one of the earliest places to spot something wrong. Some men notice their nipple has pulled inward (retracted) or shifted direction, pointing a different way than it used to. The nipple and areola may also look swollen, red, or crusty.
Nipple discharge is less common than a lump but still occurs. It can be clear, yellowish, or bloody, and it typically comes from one breast only. Bloody discharge in particular warrants prompt attention. In one documented case, a man noticed spontaneous bloody discharge alongside a lump that had been present for just six weeks, and that turned out to be cancer. Clear discharge can also be a sign. Any fluid leaking from the nipple in a man who hasn’t experienced it before is unusual enough to investigate.
How It Differs From Gynecomastia
The most common reason for breast enlargement in men is gynecomastia, a benign swelling of breast tissue that’s driven by hormones. Telling the two apart matters, because gynecomastia is far more common and not dangerous. Here are the key physical differences:
- Location: both gynecomastia and cancer tend to sit centrally behind the nipple, but a mass that’s clearly off to one side raises more suspicion for cancer.
- Symmetry: gynecomastia often affects both sides, though it can be one-sided. Cancer is almost always unilateral.
- Tenderness: gynecomastia is sometimes tender or sore to the touch. Cancer is usually painless.
- Texture: gynecomastia feels like a rubbery, diffuse disc of tissue. A cancerous lump tends to be harder, more distinct, and irregular in shape.
On a mammogram, gynecomastia shows up as a flame-shaped density that fades gradually into the surrounding fat, without the spiky edges or tiny calcium deposits that often accompany cancer. Mammography is highly accurate in men, with sensitivity and specificity both in the 90-95% range, so imaging can usually settle the question quickly.
Signs the Cancer Has Spread
When breast cancer advances beyond the breast itself, the first place it typically reaches is the lymph nodes under the arm on the same side. You might feel a firm, swollen lump in your armpit or near the collarbone. The skin over the breast may become more visibly inflamed, thickened, or ulcerated. These signs suggest the cancer has moved beyond the earliest stages and needs more aggressive treatment.
Who’s at Higher Risk
Male breast cancer can happen to anyone with breast tissue, which includes all men. But certain factors raise the odds. Inherited changes in the BRCA2 gene carry the biggest known genetic risk: men with a BRCA2 mutation have a 1.8% to 7.1% lifetime chance of developing breast cancer by age 70, compared to about 0.1% for the general male population. BRCA1 mutations also increase risk, though less dramatically (0.2% to 1.2% by age 70).
Other risk factors include a family history of breast cancer in close relatives, conditions that increase estrogen levels (such as liver disease, obesity, or certain medications), prior radiation to the chest, and older age. The average age at diagnosis is higher than in women, with most cases found in men over 60.
What Happens After You Find Something
If you notice a lump, skin change, or nipple abnormality, the diagnostic path usually starts with a physical exam followed by a mammogram and sometimes an ultrasound. Because male breast tissue is much thinner than female breast tissue, imaging tends to be straightforward. If the mammogram shows a suspicious mass (often with irregular or spiky margins), a biopsy confirms whether it’s cancer.
Survival depends heavily on how early the cancer is caught. A study tracking 81 male breast cancer patients over 21 years found five-year survival rates of about 87% for stage I, 65% for stage II, 43% for stage III, and 14% for stage IV. The overall five-year survival across all stages was 63%, which is lower than the overall rate for women. That gap is largely because men tend to be diagnosed later, often because they didn’t think breast cancer was a possibility. Catching it when the lump is small and the lymph nodes are clear makes a significant difference.