- This is such a good question and one I've wondered about too. There don't appear to have been any studies about the causes for this - but I have some guesses based on my years of moderating for the site and living with migraine for decades - so please don't take this as anything official. The dynamics I believe that could be at work for the shifting landscape of symptoms include the following:
1) As we age, our bodies shift and perhaps alter the way we respond to migraine (including hormonal changes)
2) Over time, it's possible (again perhaps due to aging or something else) that the way we process or respond to our medications shifts. Perhaps this causes changes in how migraine attacks appear within us- or it could cause varying side effects to arise that we haven't before experienced and if so, then it would become hard to parse apart what is a side effect and what is a symptom.
3) As you raised, perhaps we gain a new condition (temporarily or permanently) that interacts with migraine in a way that shifts our experience of migraine.
Again, these are just my personal reflections. What are your thoughts on this? Warmly - Holly (team member)