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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.
On the other hand, the right ventricle has to pump blood only to the lungs, which are close enough. So, the increased muscle mass of the LV causes it to offset slightly to the left and since it is the largest part of the heart, it gives a considerable impression of the heart being more to the left.