Hi lily,   A recent study was released concluding that Migraineurs with a long history and/or those who have frequent Migraine attacks are at an increased risk for silent brain damage, meaning, without sypmtoms. Continue reading this article for more information: Yes, Migraines Can Cause Brain Damage.   As far as Migraines and flying go, there are a few things you can talk to your doctor about before you fly. We have an Ask the Clincian question, "Is there a migraine medicine I can take before flying to a high altitude"? that will be helpful.   Another important point is it may be time to see a Migraine specialist. Migraine and Headache Speciialists - What's So Special? is a great article. Then you can click HERE  to see our directory of patient recommended specialists.    Good luck Nancy