Women between fifty and seventy-four who are considered at average risk for breast cancer have received new guidelines regarding mammography from the American College of Physicians. They suggest women in that group, without symptoms and with average risk should get a mammogram every two years. Definition of average risk includes women who do not have a personal or familial history of breast cancer or diagnosis of a high-risk breast lesion. Additional definitions in the guidelines are published in Annals of Internal Medicine, as well as recommendations for women of other ages. As always, the guidelines should be discussed between women and their physician, but the bottom line is screening for breast cancer is considered essential.