Atrial fibrillation, or A-fib, is becoming more common, but doctors say treatments are improving. The condition is a quivering or irregular heartbeat that can lead to blood clots, stroke and heart failure. Experts say more than 10 million Americans have it, mostly older adults. Symptoms include a pounding heartbeat and shortness of breath. Smartwatches and other devices are helping with diagnosis. Causes include genetics, high blood pressure and stress. Treatments range from medications to procedures like ablation. Experts recommend a healthy lifestyle to lower the risk.
