Is it a problem?: An enlarged left atrium is a problem if one has an arrhythmia. Then it is important to search for the underlying cause. Sometimes mild elevations of systolic or diastolic blood pressure can cause the heart muscle to become stiff; the left atrial pressure rises, its size increasing. Subtle valve problems, arrhythmias, athleticism and rare genetic problems are others. A cardiologist can help.
Answered 6/20/2020
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