It's rare for migraines to be seen as a good health omen, but new research on over 9,000 women suggests they just might lower the risk of breast cancer. Researchers say women who experience migraines may be 26 percent less likely to develop cancer than women who don't experience the headaches. And that positive statistic stays true regardless of menopausal status, age, use of prescription medications, and migraine triggers. Experts say hormones may be the reason for the link, since some...