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Sphenopalatine ganglioneuralgia, more commonly known as "brain freeze," is a sudden headache or pain that occurs when something cold touches the roof of the mouth, such as ice cream or a cold drink. The rapid cooling of the blood vessels in the sinuses triggers a nerve response, causing a sharp, intense pain that typically lasts for a few seconds to a minute. This phenomenon is believed to be a protective mechanism to prevent the brain from experiencing extreme cold temperatures.
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