Unfortunately, age increases the risk of atrial fibrillation. More than 2.3 million Americans are affected by the condition—most are age 65 and older. Other forms of heart disease, high blood pressure, chronic conditions like sleep apnea, and thyroid problems also raise the risk. Alcohol consumption and stress can also contribute. Women with atrial fibrillation are more likely to have a stroke than men. Adopting a healthy lifestyle that includes regular exercise and stress reduction can help, as can prompt treatment of those health issues that contribute to risk. Patients with metabolic syndrome, diabetes, or obesity may have a higher risk of atrial fibrillation.