What are some causes of breast cancer?

Unknown. There are some increased breast cancer risks associated with obesity, hormone medication use, early age at first menstruation, late age at first childbirth, etc. Only about 15% of breast cancers occur because of genetic inheritance. See this site with more information: http://media. Komen. Org/breastcancer101tool/english/video-player. Html#kbc_01_01.
Several. Family history, obesity, estrogen, being female, alcohol intake, decreased physical activity, and bad luck.
Listed. Good reference site: http://www. Cancer. Org/cancer/breastcancer/overviewguide/breast-cancer-overview-what-causes.