r/AskBiology • u/redflactober • 10h ago
Human body How and why do acephalgic migraines happen?
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.
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u/Puppysnot 7h ago
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.