A recent and quite large study involving over 9,000 women found that women with a diagnosis of clinical migraines have a 26% reduced risk of getting breast cancer. Migraines can be hormonally driven so there is a logical reason why researchers began looking at this. It will be interesting to see if there are other reasons, such as avoidance of alcohol (a common migraine trigger) or other factors. The authors did control for the use of anti-inflammatory drugs like tylenol and found that they did not contribute to the reduction in cancer rates. By the way, if you do suffer from migraines we have a very high success rate at getting rid of them, so you may want to set up an appointment with one of our practitioners.
 
Cancer Epidemiol Biomarkers Prev. 2009 Jul;18(7):2030-4