While a tremendous amount of research has been done on the causes of breast cancer, an exact breakdown by percentages or some such measure is still not completely accurate. Hormone levels and those levels related to age are factors. Diet and heredity are also among the most important indicators of breast cancer probability.

The hormones in question are estrogen and progesterone. Any levels significantly different from the average of the females at the age the woman is, represents an increase in probability of getting breast cancer. This includes age factors for the beginning age of menstruation as well as the ending age. If a girl begins menstruation at an early age, or a woman past middle age has not reached menopause, cancer risk increases.

Because of this connection, hormone therapy after menopause is not always a recommended practice – especially if there are is a family history with links to breast cancer. Read the rest of this entry »