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Atrial fibrillation (Afib) refers to the condition of the heart associated with a fast and irregular heartbeat (abnormal heart rhythm) occurring due to problems of electrical activity in the upper chambers (atria) of the heart. It is one of the most common types of heart arrhythmias. A normal heart beats at the rate of 60 to 100 beats per minute. An episode of atrial fibrillation can make the heart beat at the rate of over 140 beats per minute. Sometimes, there may be no symptoms; in other cases, you may feel palpitation, lightheadedness, faintness, shortness of breath, sweating, fatigue, and/or chest pain. Once the condition is diagnosed, treatment should be provided as it can lead to stroke, heart failure, and dementia.