Atrial fibrillation - Symptoms 

Some people with atrial fibrillation have no symptoms and it is only discovered during routine tests or investigations for another condition.

The most obvious symptom of atrial fibrillation is a fast and irregular heartbeat, usually over 140 beats a minute. You can determine your heart rate by feeling the pulse in your wrist or neck.

You may also experience:

• tiredness
• breathlessness 
• dizziness 
• chest pain (angina) 

The way the heart beats in atrial fibrillation reduces the heart's efficiency and performance. This can result in low blood pressure and heart failure.

If you notice a sudden change in your heartbeat and have chest pain, see your doctor immediately.