Does atrial fibrillation cause fainting?

Agin: Atral fibrillation can cause fainting in some circumstances but usually doesn't. If you have both you should see your doc for an evaluation.

Afib cause faint?: It is unlikely but i guess possible. The most common cause of faint is "vaso vagel syncope ". This is like after standing a long time, at the sight of blood, etc.

Possible with: High heart rates or significant pause following return to normal rhythm.