🧊 What Really Causes a Brain Freeze? 🧠 We’ve all had that sharp, sudden headache after eating something icy cold—but what’s actually happening? As a neurologist, I can tell you a “brain freeze” is really a cold-stimulus headache caused by rapid temperature changes that activate the trigeminal nerve and dilate blood vessels in your head. It’s short-lived but fascinating proof of how sensitive—and fast—our nervous system really is. Learn more about how your brain works at https://takesensiq.com/