This informative article by breastcancer.org describes the reasons for hair loss resulting from specific cancer treatments.  It describes what you can expect from cancer treatments such as chemotherapy, radiation and hormonal therapy.  The article also includes a list of chemotherapy drugs and their hair loss effects.

Notable quote:

There are studies that show that for many women, losing their hair is worse than losing a breast. That’s because you can conceal the loss of a breast, but hair loss is so obvious and apparent.     — Kutluk Oktay, M.D.

http://www.breastcancer.org/tips/hair_skin_nails/hair_loss