• Older age
• Early age at menstruation
• Older age at first birth or never having given birth
• A personal history of breast cancer or benign breast disease
• A first-degree relative — mother or sister — with breast cancer
• Treatment with radiation to the breast or chest at an early age
• Breast tissue that is dense on a mammogram
• Hormone replacement therapy
• Obesity
• Drinking alcoholic beverages
• Genetic mutation
Source: National Cancer Institute
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