Pulmonary hypertension is a rare lung disease in which the blood pressure in the main artery to your lungs is very high. This high pressure results in changes in the lung’s blood vessels and keeps the blood from flowing normally through these vessels.

The right ventricle and right atrium are the two chambers on the right side of the heart. High pressures in the lung’s vessels causes these chambers to become enlarged and weak and to not pump as well, resulting in right sided heart failure. Pulmonary hypertension is a long term or chronic disease. It affects both sexes, but is more common in women, and occurs between 30-45 years of age.