Atrial fibrillation is a type of irregular heartbeat. When the top part of your heart beats out of rhythm, it can lead to poor blood flow. That can cause blood to pool and form clots. These clots can travel to your brain and cause a stroke.
A stroke happens when blood flow to the brain is blocked. This can cause serious problems, like trouble speaking, moving, or even death.
Everyone's risk is different. This tool can help you think about your own risk, but your doctor will guide you through the details.