If you’re just beginning your search for information on breast cancer, you’ve come to the right place.
Many changes will 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 describes these changes and is a good first step to find out about breast cancer and benign (not cancer) breast conditions.
This section also includes breast cancer statistics and information on breast cancer in men.
Explore these topics and much more through the menu on the left or through the links below.
In 2017, it's estimated that among U.S. women there will be*:
Breast cancer occurs when cells divide and grow without their normal control.
If the abnormal cells grow inside the milk ducts, but do not spread to nearby tissue, the condition is ductal carcinoma in situ (DCIS). Invasive breast cancer occurs when cancer cells spread to nearby tissue or other parts of the body.
Invasive breast cancer that spreads 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 all women. 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.
Other conditions and benign (not cancer) 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 2017. Atlanta, GA: American Cancer Society, 2017.
Facts for Life: Breast Cancer Facts
Breast Cancer 101 - Incidence in the U.S.
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