- Being younger when you had your first menstrual period
- Never giving birth, or being older at the birth of your first child
- Starting menopause at a later age
- Using hormone replacement therapy for a long time
- Getting older
- A personal history of breast cancer, dense breasts, or some other breast problems
- A family history of breast cancer (parent, sibling, or child)
- Changes in your breast cancer related genes (BRCA1 or BRCA2)
- Getting radiation therapy to the breast or chest
- Physical inactivity and poor nutrition
- Being overweight, especially after menopause
- For more information: http://www.breastcancer.org/risk/factors
