National Institutes for Health, “survivors are at an increased risk of osteoporosis. Estrogen has a protective effect on bones, and reduced estrogen levels can trigger bone loss.” 30. Become an Expert at Self-Examinations Eight out of 10 breast lumps are discovered by women themselves. So don’t underestimate the importance of a monthly breast self-exam. By becoming more familiar with your breast tissue and appearance, you will be more likely to notice changes and contact your doctor.