Some people with atrial fibrillation (A-fib) don't notice any symptoms. Those who do have atrial fibrillation symptoms may have signs and symptoms such as: 
Sensations of a fast, fluttering or pounding heartbeat (palpitations)
Chest pain
Dizziness
Fatigue
Lightheadedness
Reduced ability to exercise
Shortness of breath
Weakness
 Atrial fibrillation may be: 
Occasional (paroxysmal atrial fibrillation). A-fib symptoms come and go, usually lasting for a few minutes to hours. Sometimes symptoms occur for as long as a week and episodes can happen repeatedly. Symptoms might go away on their own. Some people with occasional A-fib need treatment.
Persistent. With this type of atrial fibrillation, the heart rhythm doesn't go back to normal on its own. If a person has A-fib symptoms, cardioversion or treatment with medications may be used to restore and maintain a normal heart rhythm.
Long-standing persistent. This type of atrial fibrillation is continuous and lasts longer than 12 months.
Permanent. In this type of atrial fibrillation, the irregular heart rhythm can't be restored. Medications are needed to control the heart rate and to prevent blood clots.
