The exact cause of breast cancer remains unknown, but certain risk factors appear to be associated with developing the disease.
- Age (Most breast cancers occur in women over 50, with the highest risk in women over 75. Breast cancer can also occur in men, but the number of cases is extremely small.)
- Family history of breast cancer (Women who have a first-degree relative - a sister, mother or daughter - with breast cancer are at increased risk themselves.)
- Personal history of breast cancer (Women who have previously had cancer in one breast are at increased risk for developing a new cancer in the other.)
- No pregnancies, or first pregnancy after age 30
- Early onset of menstruation (before age 12)
- Late menopause (after age 55)
- Use of hormones (Long-term use of hormone replacement therapy - estrogen combined with progesterone - may increase the risk of breast cancer. It is unclear if the use of contraceptive pills increases risk. )
- History of radiation treatment to the chest
- Alcohol consumption (2 or more drinks a day)
- Postmenopausal obesity
- Diet (There is conflicting data that suggests a diet high in fat may increase the chances of getting breast cancer.)
- Race (Caucasian women are slightly more likely to be diagnosed with breast cancer.)
- Gene (BRCA1 and BRCA2) mutations (see below)
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