The best way for young women to find breast cancer early is to be breast self-aware. Become familiar with your breasts: their shape, size and what they feel like. Learn what is normal for you. Sometimes your breasts may change throughout your monthly cycle. If you are pregnant or nursing, your breasts will change even more dramatically. If you find anything unusual, see your doctor immediately and insist on a diagnosis. In general, women should have a yearly clinical breast examination by a doctor beginning at age 20 and start having annual mammograms beginning at age 45.