Atrial fibrillation is a type of irregular heartbeat that can cause blood clots to form in your heart. Having atrial fibrillation increases your risk of stroke by five times.
Anyone can have a stroke, although there are some things that make you more at risk than others.
An ischaemic stroke happens when a blood clot, or other blockage, cuts off the blood supply to your brain. This is the most common type of stroke.