[Editor's Note: This article was originally published in 2013 but has been updated for accuracy and comprehensiveness in 2026.]
How does light trigger migraines? Quick answer: Light triggers and worsens migraine because specialized cells in the retina, called intrinsically photosensitive retinal ganglion cells (ipRGCs), send signals along a pathway that converges with the brain's pain-processing (trigeminal) system. This is why bright, flickering, or blue-heavy light can start an attack or...
