Definition of Brain freeze

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Brain freeze: A headache that occurs when one puts ice, a cold food, or a chilled beverage in the mouth, chilling the roof of the mouth. Ice cream is by far the most frequent offender. Brain freeze is characterized by a stabbing, aching pain that begins a few seconds after ingestion of something cold. The pain peaks in 30 to 60 seconds. No treatment is required. Also known as an ice cream headache.