Causes of non valvular atrial fibrillation?

Many: High blood pressure is a risk factor. Consider high thyroid levels, premature heart beats, or high amounts of Epinephrine (rare). There are other rare causes. Most times we don't find a specific cause- age increases risk for af- the most common heart rhythm disorder.

HTN,CAD, Hyperthyroi: High blood pressure heart attacks alcohol heart defects you're born with (congenital) an overactive thyroid gland or other metabolic imbalance exposure to stimulants, such as medications, caffeine or tobacco, or to alcohol sick sinus syndrome — functioning of the heart's natural pacemaker emphysema or other lung diseases previous heart surgery viral infections stress due to pneumonia.