Yes, it has been considered. And the most recent research does suggest that the ingredients in marijuana can have an effect on the brain's pain mechanism, in some patients. There are additional research products underway to better refine our understanding of marijuana and pain. The diagnosis of migraine centers around fulfilling the criteria for migraine, such as, periodic headaches, associated with light-sensitivity, nausea and or vomiting, throbbing pain, and a variety of other symptoms that may go along with migraine. Sometimes people vary in where the headache hurts, or whether it pounds, or whether it's on one side or another.
Some people can have stroke-like symptoms with migraines, or blind spots.
Secondly, migraine is diagnosed by ruling out other serious illnesses that can mimic migraine. So, in some ways migraine is diagnosed by exclusion of other conditions. What are the manifestations of a migrane. There are numerous people who will have the visual or other symptoms of migraine but who will not have a headache. One of the most common of those symptoms are shimmering, glaring blind spots, sometimes colored that can cross the visual field over a period of 15 or 20 minutes.