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7. Arrhythmias

Although extremely uncommon, brain freeze may coincide with paroxysmal atrial fibrillation or an irregular heartbeat. One study examined a rare case where a patient developed both brain freeze and atrial fibrillation after ingesting an ice-cold drink. This phenomenon was reported a few times in the literature, though the idea that atrial fibrillation can result from swallowing has been around since the 1930s.

heart rhythm monitor Thierry Dosogne / Getty Images

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