Assertion: atrial fibrillation | /r/CreatedBy | various lung problems
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text: We have known for a long time that atrial fibrillation can be caused by numerous medical problems, including heart disease (such as coronary artery disease, mitral regurgitation, and pericarditis), thyroid disease, hypertension, sleep apnea, various lung problems, such as pneumonia or pulmonary embolism, and (for some people) drinking alcohol.