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Signs and Symptoms of Arrhythmias Chest Pain Shortness of Breath Sweating Fainting or Nearly Fainting Dizziness and Light-Headedness Weakness Arrhythmia Anxiety Feeling of Pauses Between Heartbeats Irregular Heartbeat Slow Heartbeat Palpitations Source: U.S. Department of Health and Human Services, National Institutes of Health, National Heart Lung and Blood Institute. nhlbi.nih.gov