Atrial fibrillation on its own can be unpleasant or alarming, but it doesn't always cause major medical issues. However, AFib that remains untreated over time can exacerbate or precede more serious issues, including stroke, heart failure, or inconsistent blood supply. It may even lead to other heart rhythm problems or chronic fatigue. People with atrial fibrillation are also at higher risk of developing stroke and heart failure.

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