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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.
Gastrointestinal factors that can cause pain in right side of the chest include. 1  Reflux Disease and Peptic Ulcers â Reflux disease, which is referred to a condition in which the food or stomach contents get regurgitated into the food pipe, can cause pain on right side of the chest or under the breastbone.