First, let's get one thing straight. "This condition is referred to as an 'ice-cream headache,' " says Stacey Gray, a sinus surgeon at the Massachusetts Eye and Ear Infirmary in Boston. "It's a very technical term." Although there's no published paper saying as much, a milkshake slurped too quickly probably does not actually lower brain temperature. Besides, Gray says, the temporary pain can't do any harm because it has nothing to do with the brain.