Atrial fibrillation is a common heart condition characterized by an irregular and often rapid heartbeat. It occurs when the electrical signals in the heart become disorganized, leading to ineffective pumping of blood. This can result in symptoms such as palpitations, shortness of breath, and fatigue. People with atrial fibrillation are at a higher risk for complications, including stroke and heart failure. Treatment options may include medications to control the heart rate or rhythm, as well as procedures like cardioversion or ablation to restore a normal heartbeat.