See your GP immediately if you have chest pain and notice a sudden change in your heartbeat.
Atrial fibrillation is a condition that causes an irregular and often fast heartbeat.
Symptoms of atrial fibrillation include heart palpitations, dizziness and shortness of breath.
It's not clear what causes atrial fibrillation, but it's common in people with other heart conditions.
Treatments for atrial fibrillation include medicines to control your heartbeat and thin your blood.
Page last reviewed: 24/04/2018
Next review due: 24/04/2021