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What causes atrial fibrillation?

Atrial fibrillation (AFib) is a term that describes the condition where the atria of the heart (two upper chambers) are out of sync with the ventricles (two lower chambers). AFib can present as heart palpitations, or skipping or adding a heartbeat. The causes of atrial fibrillation vary from coronary artery disease to hypertension to congenital heart defects or even hyperthyroidism.

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