What are the real causes of breast cancer? who should be afraid?

Many factors: Established risk factors include: female gender, age, family history, genetics, personal history of breast cancer, radiation t chest/face prior to age 30, prior history of certain benign breast lesions, white women, overweight, not having a full term pregnancy by age 30, and others. Refer to http://www.breastcancer.org/risk/factors for more detail. This reflects the large amount of research done.

Not afraid.: There are risk factors that increase the risk of breast cancer. Dr. Bauer expertly listed those factors so I won't go over it again. Just wanted to say that fear serves no purpose other than ruining your life. Be aware, be alert, be informed, but do not live in fear.