I had migraines which ceased when I switched from a steroid nasal spray to an allergy nasal spray. I guess the steroid spray was not good for my brain. Edit:

I had migraines which ceased when I switched from a steroid nasal spray to an allergy nasal spray. I guess the steroid spray was not good for my brain. Edit: I even reintroduced the spray 2 years later (out of allergy spray) and had another migraine. It was surprising, as I only used it for a few days.