All About Brain Freeze: Here’s Why We Get The Ice Cream Headache

Other scientists believe the pain is caused by a rush of blood to the front of your head. Shortly after the vessels in your throat and mouth shrink from the cold, these same vessels immediately expand. By expanding, additional blood and oxygen flood these areas. Although this blood rush might provide your brain with desperately needed blood and oxygen, it also might increase the amount of pressure in your head, causing pain.