It is easy in California. Go see the pot doc tell him you get migraines. Then you will have to go to an internal medicine doctor and tell him the same thing, he will write you a prescription for migraine meds. Take that back to the pot doc pay the 175.00 fee and wa la you would then be considered a cannabis patient. I know if you are prescribed anything for anxiety or depression he can issue a cannabis card for that too. You have to renew your card every year. Each county here in cali has different limits so be aware of that as well.