20/20 Magazine: Beyond Brain Freeze-Visually Induced Trigeminal Dysphoria

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Trigeminal dysphoria—wait, what? I admit the first time I heard the words trigeminal dysphoria, I was both intimidated and intrigued. (And yes, I had to practice its pronunciation!) Let me give an example of trigeminal dysphoria that we can all relate too—brain freeze! This sharp headache occurs when there is a sudden change in temperature when we drink or eat something cold like ice cream, which excites the neural feedback loop to the trigeminal nerve and causes the sensation of pain. What does this have to do with eyes? Read More