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6. Trigeminal Nerve

Some researchers believe brain freeze is mediated by the trigeminal nerve. One study used a transcranial Doppler to visualize a sudden and dramatic increase in blood flow during brain freeze. The vasodilation and the pain resolved with the ingestion of warm water. The trigeminal nerve relays sensory information from the face and head to the brain and may play a role in this process.

trigeminal nerve pain PeopleImages / Getty Images

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