> When May started researching migraine in the 1990s, the leading hypotheses were that migraine was either a psychological issue or a vascular headache disorder, with throbbing pain caused by dilation of blood vessels. The psychological associations came with stigma, May says. [...] A lot changed in the 1990s, when May and others began conducting brain scans of people with migraine.

Sure, who the hell is this guy, and his discovery of the cortical spreading depression phenomenon:

https://en.wikipedia.org/wiki/Aristides_Le%C3%A3o