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Hello. Thank you for posting.

Abnormalities or damage to the heart's structure is the most common cause of atrial fibrillation. Possible causes of atrial fibrillation include:
High blood pressure
Heart attacks
Coronary artery disease
Abnormal heart valves
Heart defects you're born with (congenital)
An overactive thyroid gland or other metabolic imbalance
Exposure to stimulants, such as medications, caffeine, tobacco or alcohol
Sick sinus syndrome — improper functioning of the heart's natural pacemaker
Lung diseases
Previous heart surgery
Viral infections
Stress due to pneumonia, surgery or other illnesses
Sleep apnea

We can't know what caused your A Fib, specifically. What did your doctor(s) tell you?

Helena