Greetings All
I know migraines are considered hereditary but I would like to submit at least some suspicion that they can either be caused or complicated by traumatic brain injury.
http://m.brainline.org/content/content.php?id=834
http://www.achenet.org/resources/epidemiology_of_military_posttraumatic_headache/
http://www.ncbi.nlm.nih.gov/pubmed/1774160
Please note the government position is PTH has a strong neurosis component perhaps designed to ward off future compensation cases-