If you’re just beginning your search for information on breast cancer, you’ve come to the right place.
Many changes occur in your breasts during your lifetime. Throughout puberty, pregnancy and menopause, the look, structure (anatomy) and function of your breasts change.
Learning about breast anatomy and how the breasts function can help you understand which changes are normal and which are not.
This section is a good first step to learn about breast cancer and benign (not cancer) breast conditions. It also includes information on breast cancer in men and breast cancer statistics for many populations.
Explore these topics and much more using the menu on the left or through the links below.
In 2020, it's estimated that among U.S. women and men there will be*:
Breast cancer occurs when cells divide and grow without their normal control.
Ductal carcinoma in situ (DCIS) occurs when the abnormal cells grow inside the milk ducts, but have not spread to nearby tissue. DCIS is a non-invasive breast cancer.
Invasive breast cancer occurs when cancer cells spread to nearby tissue or other parts of the body.
Invasive breast cancer that spreads beyond the breast and nearby lymph nodes to other parts of the body is called metastatic breast cancer.
Learn more about breast cancer.
Learn more about DCIS.
Learn more about invasive breast cancer.
Learn more about metastatic breast cancer.
The warning signs of breast cancer are not the same for everyone.
The most common signs are a change in the look or feel of the breast, a change in the look or feel of the nipple and nipple discharge.
Learn more about the warning signs of breast cancer in women.
Learn more about the warning signs of breast cancer in men.
Other conditions and benign changes can occur in the breast. Some increase the risk of breast cancer and others do not.
Learn about lobular carcinoma in situ (LCIS).
Learn about benign breast conditions.
*American Cancer Society. Cancer Facts and Figures 2020. Atlanta, GA: American Cancer Society, 2020.
Breast Cancer 101 - Incidence in the U.S.
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