The cause of atrial fibrillation is not fully understood, but it tends to occur in certain groups of people and may be triggered by certain situations, such as drinking excessive amounts of alcohol or smoking. Some people with atrial fibrillation have no symptoms and are completely unaware that their heart rate is irregular.įind out more about the symptoms of atrial fibrillation Why does atrial fibrillation happen and how common is it?Ītrial fibrillation is the most common heart rhythm disturbance and affects up to 800,000 people in the UK.
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