Primary Pulmonary Hypertension is a rare lung disease that occurs when the blood pressure in the pulmonary artery is abnormally elevated. This condition causes less oxygen to get into the blood stream. Also, the right ventricle of the heart has to work much harder to pump blood into the lungs. Over time, the heart muscles can weaken and fail, resulting in heart attack. PPH symptoms typically include shortness of breath and chest pain. Patients can die without PPH treatment.