Atrial fibrillation (AF or Afib). Afib is a type of arrhythmia. Afib makes it easier for your blood to clot because your heart cannot pump as well as it should. This can lead to heart failure or stroke. Afib symptoms include heart flutters and, a fast heartbeat as well as dizziness and shortness of breath.

Atrial fibrillation usually causes an elevated heart rate and may cause additional symptoms such as:

  • Heart flutter
  • Fatigue
  • Shortness of breath
  • Dizziness or lightheadedness
  • Chest pain

Atrial fibrillation usually isn’t life-threatening, but it can increase your risk for severe complications, including blood clots, stroke, and heart failure.