Inherited genetic variants: Certain inherited changes, including pathogenic variants in genes such as BRCA1 and BRCA2, can substantially increase risk.

Hormonal and reproductive factors: Lifetime exposure to certain hormones can influence risk.

Alcohol consumption: Alcohol intake is associated with increased breast cancer risk.

Excess body weight after menopause: Higher amounts of body fat after menopause can increase risk.

Physical inactivity: Regular physical activity is associated with several health benefits and may lower breast cancer risk.

Having a risk factor does not mean that someone will develop breast cancer, while people without obvious risk factors can still develop it.

Why Screening Matters

One of the biggest misconceptions about breast cancer is that you should wait until you notice a symptom before seeking care.

Screening exists precisely because breast cancer can sometimes be detected before it causes noticeable symptoms.

Depending on your age, personal risk, family history, and country, screening may include mammography or other imaging.

People at higher genetic or familial risk may need a different screening strategy.

Your healthcare professional can help determine which approach is appropriate for you.

What Should You Do If You Find a Breast Change?

First, don't panic.

Most breast changes are not cancer.

Instead, take note of what you noticed:

• When did it begin?
• Is it changing?
• Is it present in one breast or both?
• Is there a lump?
• Is there nipple discharge?
• Are there skin changes?
• Is there swelling or persistent pain?

Then make an appointment with a healthcare professional if the change is new, persistent, or concerning.

Do not attempt to diagnose yourself by comparing your symptoms with photographs online.

A medical examination and appropriate testing are much more reliable.

The Bottom Line

Breast cancer can present in many different ways, and some people may have no obvious symptoms at all.

Possible warning signs include a new lump, persistent swelling, unexplained changes in breast size or shape, skin dimpling or thickening, a newly inverted nipple, unusual nipple discharge, or persistent changes around the breast or armpit.

At the same time, symptoms such as breast pain, redness, or a lump can have many causes that are not cancer.

The most important thing is not to ignore a change simply because it does not hurt—and not to assume that every unusual symptom means cancer.

Know what is normal for your body, follow appropriate screening recommendations, and have persistent or unexplained changes evaluated by a healthcare professional.

Early evaluation can provide answers, reduce unnecessary anxiety, and—when a serious condition is present—help ensure that appropriate treatment is started as soon as possible.