A mammogram is an X-ray image of your breasts. It can be used either for breast cancer screening or for diagnostic purposes, such as to investigate symptoms or unusual findings on another imaging test.

During a mammogram, your breasts are compressed between two firm surfaces to spread out the breast tissue. Then an X-ray captures black-and-white images that are displayed on a computer screen and examined for signs of cancer.

Mammograms play a key role in breast cancer screening. They can detect breast cancer before it causes signs and symptoms. Mammograms have been shown to reduce the risk of dying of breast cancer.