A<unk> , colloquially known as an ice-cream headache or brain freeze, is a form of brief pain or headache commonly associated with consumption (particularly quick consumption) of<unk>  beverages or foods such as ice cream, Popsicles, and snow cones. It is caused by having something<unk>  touch the roof of the mouth, and is believed to result from a nerve response causing rapid constriction and swelling of blood vessels or a "referring" of pain from the roof of the mouth to the head. The rate of intake for<unk>  foods has been studied as a contributing factor. It can also occur during the sudden exposure of unprotected head to<unk>  temperatures, such as by diving into<unk>  water. A<unk>  is distinct from dentin hypersensitivity, a type of dental pain that can occur under similar circumstances. Cats and other animals have been observed exhibiting a similar reaction when presented with a similar<unk> .
Cold-stimulus headache
External compression headache
Thunderclap headache
Tension headache
Vascular headache
Lupus headache
Hypnic headache
Cluster headache