Understanding Breast Cancer: Risks, Signs, and Screening

Breast cancer is the most common cancer diagnosed in women worldwide. In the U.S. alone, about 1 in 8 women will develop invasive breast cancer during their lifetime. But thanks to increased awareness, better screening, and improved treatments, survival rates continue to rise.

Still, early detection remains key. In honor of National Women’s Health Month, here’s what every woman should know about breast cancer risks, warning signs, and screening guidelines.

What Is Breast Cancer?

Breast cancer occurs when cells in the breast begin to grow uncontrollably, often forming a lump or mass. Most breast cancers start in the ducts or lobules—the structures that produce and carry milk.

There are many types of breast cancer, but the most common include:

• Invasive ductal carcinoma
• Invasive lobular carcinoma
• Ductal carcinoma in situ (DCIS)

The sooner it’s found, the more treatable it is.

Who’s at Risk?

Every woman is at risk of developing breast cancer, but several factors can increase that risk:

• Age – Risk increases with age, especially after 50
• Family history – A first-degree relative (mother, sister, daughter) with breast cancer raises your risk
• BRCA1 or BRCA2 gene mutations
• Early menstruation or late menopause
• No pregnancies or late first pregnancy (after age 30)
• Hormone replacement therapy (HRT)
• Alcohol use and obesity

That said, most women diagnosed have no family history, so regular screening is important for everyone.

Signs and Symptoms to Watch For

Breast cancer doesn’t always cause symptoms in the early stages, which is why routine screening is so important. Still, be aware of changes in your body.

Possible warning signs include:

• A lump or thickening in the breast or underarm
• Swelling or dimpling of part of the breast
• Skin irritation or changes in texture (like orange peel skin)
• Nipple discharge (especially bloody)
• Nipple inversion or change in direction
• Pain in the breast that doesn't go away

If you notice anything unusual, don’t wait—talk to your doctor right away.

Screening: When and How Often?

Self-Exams
Get familiar with how your breasts normally look and feel. Do monthly self-exams and report any changes to your provider.

Clinical Breast Exams
During your annual physical, your provider should perform a manual breast exam.

Mammograms
A mammogram is an X-ray of the breast and remains the gold standard for early detection.

• Ages 40–44: You may begin annual mammograms if you choose
• Ages 45–54: Get mammograms every year
• Ages 55+: Every 1–2 years depending on your health and preference

High-Risk Women
If you have a strong family history or BRCA mutation, your provider may recommend starting mammograms earlier or adding an annual MRI.

What About 3D Mammograms or Ultrasound?

• 3D mammograms (tomosynthesis) provide more detailed images and are better at detecting cancer in dense breast tissue.
• Ultrasound may be used alongside a mammogram if you have dense breasts or a suspicious lump.

Can Breast Cancer Be Prevented?

While not all cases are preventable, you can reduce your risk with lifestyle choices:

• Maintain a healthy weight
• Limit alcohol to one drink per day or less
• Exercise regularly
• Eat a diet rich in fruits, vegetables, and whole grains
• Avoid smoking
• If using HRT, do so under close medical supervision

For high-risk women, preventive medications or prophylactic surgery may be recommended.

Take Charge of Your Breast Health

Breast cancer is scary—but knowledge is power. The more you understand your risk and take advantage of screening tools, the more control you have over your health.

Don’t wait for a symptom to get checked. Early detection saves lives.