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Pulmonary hypertension is high blood pressure within the artery that connects the lungs and heart. It forces the heart to work harder to transfer blood between the heart and lungs, which may lead to an enlargement of the right side. Thyroid problems, whether they involve an underactive or overactive thyroid, can cause a heart to enlarge.
Clots that develop on the right side of the heart may travel to the lungs, a dangerous condition called a pulmonary embolism. Heart murmur: For people who have an enlarged heart, two of the heart's four valves â the mitral and tricuspid valves â may not close properly because they become dilated, leading to a backflow of blood.