Breast cancer is 1 of the most common types of cancer in women in the U.S. Once breast cancer occurs, cancer cells can spread to other parts of the body, making it life-threatening. The good news is that breast cancer is often found early, before it has spread.
It is important to remember that a lump or other changes in the breast, or an abnormal area on a mammogram, may be caused by cancer or by other, less serious problems.