Mammography is the best available screening method for finding small cancers that you cannot feel yourself, but it does not find all breast cancers, and that is why it is important to participate in screening regularly. The risk of missing a cancer during a screening depends on a woman’s age and the density of her breasts. The risk is higher for younger women because breast tissue is usually denser before menopause. Organized breast cancer screening programmes in the European Union usually have two radiologists read every mammogram to help reduce the risk of missing a cancer.