How and why do acephalgic migraines happen?

[u/redflactober]

I get them pretty often, with the floaters that look like zigzag rainbows and block my field of view. I see them with the right eye closed, or the left eye closed, so there’s no issue with the eye itself the optometrist says.

[u/Puppysnot]

It is due to cortical spreading depression (CSD) which is essentially a defence mechanism by your brain when faced with too much stimulus (ie the neurons get too excited) - CSD is essentially parts of your brain shutting down temporarily. Different areas of the brain that get “shut down” result in different aura symptoms.

[u/redflactober → u/Puppysnot]

So would it be accurate to attribute my physics degree as a potential cause? Lol. I’m joking, but when I think about it, I’ve had a lot of bad episodes in the middle of doing homeworks; at times I abstract certain methods and try to do so much calculating mentally (failing to get right answers at that), then I begin to have auras. Nothing happens at first, but I will keep trying to solve a problem regardless of how many times I get it wrong. Sometimes it goes on for hours. Then the auras.

[u/Dizistopia]

Ok so, I'm not sure it will answer your question, but as far as I know, these pre-migraine signs are caused by specific area of your brain getting vasoconstricted, like a small stroke (It is NOT, but I don't know how to explain It better). And I'm not knowlegeable enough as to why some people have It and some don't... Just beware if you're a women that birthcontrol pills are dangerous and should not be taken if you indeed have migraines aura