Never stopping tediousness is another sign of potential atrial fibrillation. Each time a person with this problem does something physically, he or she feels overwhelmed very quickly even if the task is not difficult at all. Having more sleep does not help to get rid of this feeling exhausted. The erratic heartbeat is the first thing to consider when trying to understand what provokes such condition.

Inability to take a deep breath. Just like people with asthma and some similar disorders, patients with atrial fibrillation complain about having difficult times breathing. Most often, it is the result of high physical activity like swimming, running, riding a bike, or else. It is usually okay for an average man to experience shortness of breath after such sessions, but this phenomenon may also be a symptom of AFib.