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• Arrhythmias
• Atrial Fibrillation
  • Overview
  • Signs and Symptoms
  • Risk Factors
  • Causes
  • Diagnosis
  • Treatments
  • Physicians and Services
  • How Much Do You Know About Atrial Fibrillation?
  • Atrial Fibrillation in Depth (video)
  • Atrial Fibrillation Can Be A Family Affair
  • Is An Atrial Fibrillation Epidemic On The Way?
  • Coumadin Do's and Don'ts
  • 10 Questions to Ask Your Doctor
  • The Stroke Connection
  • Bruce MacDonald's Patient Story
  • Mostafa Salem's Patient Story
• Bradycardia or Low Heart Rate
• Brugada Syndrome
• Long QT Syndrome
• Palpitations
• Sudden Death or Cardiac Arrest
• Syncope or Fainting
• Tachycardia or Fast Heart Rate
• Wolff-Parkinson-White Syndrome

Causes

Causes Not Completely Understood

Scientists do not completely understand what causes AF.

It is thought that abnormalities or damage to the heart's structure are the most common causes, although some people with AF have no heart defects or damage. This is known as lone atrial fibrillation.