Sometimes. It is estimated that approximately 10-15% of all breast cancers in the US are of the hereditary type. These genes can be inherited from either your father or your mother. If a woman inherits this gene, they have a 50-75% chance of developing breast cancer in their lifetime. These cancers tend to occur at any earlier age and may occur in both breasts.
Genetics. There is a genetic compnent of risk for breast cancer. It is possible that if particular family members ( Mother, Sister, Grandmother...) have had breast cancer that you are at higher risk for breast cancer. If you have a concern about this, please discuss your risk and what you can do about it with your family doctor or surgeon.
It can be. Even with a family history of breast cancer, the majority of breast cancers are known as "sporadic"; approximately 5-10% of inherited breast cancers are related to a mutation in the brca 1 or brca 2 genes.
Can be. It can be, although the vast majority of women with breast cancer do not have a family history.