Don't think we are allowed to post links here, but if you do a Google search you can find a medical study that links corticosteroid nasal sprays to migraine. Unfortunately, it's not limited to Flonase, they found this problem with six different ones. I wasn't aware there were that many. I suffer from what I term sinus migraines on a nearly constant basis. Tried Flonase thinking it might help, and I got horrible ocular migraines with pain running all the way down to my shoulder. I've never had a migraine to cause pain to radiate beyond my head before. Each time I used Flonase, and within 30 minutes the migraine would start. This time I took a hot shower as soon as my migraine began, and it seemed to bring it from excruciating to painful but I can still function. It's ridiculous that migraine suffers aren't warned about these medications, since there is clearly a link between them.
I do suffer from migraines. But about a week after Flonase I started getting horrible ones, they take only seconds to come on now, and occur almost every day whereas before they took hours to start and I had them 6 or 7 times a month. They now happen whenever I go to the gym to exercise or whenever I worry about something and they are 3 times as painful as they were before, even Ibuprophen no longer helps to lessen the symptoms, and I end up throwing up. Before the migraines weren't localized as much but now I have them in the right frontal lobe area. Yesterday it was so painful, I couldn't help having thoughts about suicide, and it dawned on me that rather than an aneurysm or something even worse, it could simply be Flonase, so I went online and discovered a small pilot study of this - which didn't come up with any definitive evidence due to small N, yet its results warranted further investigation because of a statistically significant relationship between corticosteroid sprays and worsening migraine. I also discovered a very high number of anecdotal reports of this occurring, which doesn't happen with other side unusual side effects from this medication. Therefore I decided to stop using Flonase in hopes that these newer migraines with vengeance subside. If they do I will post once again to confirm.