Studies in animals indicated that in branches of the
nerve that exit from the back of the
brain and wrap around various parts of the face
and head, overactive cells would respond to
typically benign lights, sounds
and smells by releasing chemicals that transmit pain signals
and cause migraine.
Once triggered in the body, these inflammatory agents transfer information to the nervous system,
typically through stimulation of major
nerves such as the vagus, which connects5 the gut
and brain.