This is completely anecdotal... I too have had a long history of migraines (now recently diagnosed as migraibe-like cluster headaches). I also had a migraine-free pregnancy. When I first began breastfeeding my daughter I found the headaches returning. These quickly subsided as i became more comfortable with the process (emotionally ) and as my body mechanics improved ( We positioned ourselves properly and comfortably with my feet slightly elevated and my neck in a good position or our favorite... lying down), and with proper positioning at the breast and no more nipple pain therefor no tense muscles and no clenched teeth. For what it's worth Paula