Here are some articles saying that thyroid issues CAN also cause migraines.
Excellent article about headaches and migraine frequency not being low enough. I have about 5-7 migraines a month and about 3 to 4 headaches a week. Which isn’t enough for most conventional and non-conventional treatments to be given to me. I only suffer most of the month with either 5-7 migraines and on average 3 headaches (roughly 15-18 a month NOT counting the migraines). So sorry, out of luck for insurance covering anything else for me!