Stethoscope sits on a heart rate chart
Atrial fibrillation (AFib) is a heart arrhythmia that is more prevalent than you think.

Senior man wiping sweat off his face with towel

4. Exercise Intolerance

Exercise intolerance is a fairly typical symptom associated with AFib — the heart is not beating effectively and the body is fatigued already due to a lack of oxygen-rich blood. Exercise may make the heart beat more rapidly, may increase fatigue and may cause an increase in shortness of breath.

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