Age (most breast cancers are diagnosed after age 50)
Genetic mutations such as BRCA1 and BRCA2
Early menstrual periods before age 12 and starting menopause after age 55 expose women to hormones longer, thus increasing your risk
Women with dense breasts are more likely to get breast cancer and the tumors are harder to find on an MRI
Personal history of breast cancer or certain non-cancerous breast diseases.
Family history of breast cancer.
Previous treatment using radiation therapy before age 30 have a higher risk
Women who took the drug diethylstilbestrol (DES), which was given to some pregnant women in the United States between 1940 and 1971 to prevent miscarriage, have a higher risk. Women whose mothers took DES while pregnant with them are also at risk.
Not being physically active.
Being overweight or obese after menopause.
Taking hormones for more than five years
Having the first pregnancy after age 30, not breastfeeding, and never having a full-term pregnancy can raise breast cancer risk.
Studies show that a woman’s risk for breast cancer increases with the more alcohol she drinks.