The desire for relief from migraines and headaches motivates investigation of the mechanisms and causes of head pain. Almost a century ago, it was speculated that headaches stemmed from digestive conditions, but with improved techniques for researching the brain, it now seems that migraines are caused by neural dysfunction which makes certain areas of the brain susceptible to pain.
"Presumptions about the Mechanics and Causes of Headaches and Migraines over the last Century: A Historical Perspective,"
Sound Neuroscience: An Undergraduate Neuroscience Journal: Vol. 1
, Article 11.
Available at: http://soundideas.pugetsound.edu/soundneuroscience/vol1/iss1/11