Brain Freeze

Ice cream headaches are a common occurence for those slushy lovers out there. This post is for you. Wikipedia describes frozen brain syndrome as, "A reaction triggered by a cold substance consumed coming into contact with the roof of the mouth". It elaborates further describing how the cold stimulus irritates the specific nerves in the region of sphenopalatine ganglia. This causes them to spasm, then the nerves cause blood vessels in the brain to dilate. An article by Joseph Hulihan described the area, "The pain is usually located in the midfrontal area, but can be unilateral in the temporal, frontal, or retro-orbital region". The acute headache occurs as a result of this exaggerated dilation. Wikipedia then mentioned that this is similar to the headache someone might feel after taking a vasodilator like Nitroglycerin or Viagra. The Hulihan site further mentioned that ice cream headaches only happen on hot days, and their seems to be inconsistencies as to whether ice cream headaches are more or less common in chronic migraine sufferers.

These are the sites I found my info on.
Wikipedia
Joseph Hulihan site