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Certain risk factors increase chances of breast cancer, and can develop before observable symptoms: > Women are at a greater risk of breast cancer than men, and can be attributable to exposure to hormones such as estrogen and progesterone. > Breast cancer risk increases as you age. The average age of patients with breast cancer was 45-50 years, according to a study in North India. > Family history of cancer increases the risk of breast cancer, especially if family members were diagnosed with breast cancer at a young age. > Previously having breast cancer in one breast can lead to the development of breast cancer in the other breast. > Some rare gene mutations and genetic factors have been observed in people with breast cancer, most commonly BRCA1 and BRCA2 genes. > The occurrence of menstrual cycles before age 12 or menopause at an older age has increased risks associated with breast cancer. > Lifestyle related risk factors include being pregnant, obesity, intake of hormones, exposure to radiation, lactation, and consumption of alcohol.