SPEAKER: If you have pulmonary arterial hypertension, or PAH, it means that you have high blood pressure in your pulmonary arteries– the blood vessels that carry blood from your heart to your lungs. Your heart and lungs work together to pump blood throughout your body. Oxygen rich blood from your lungs goes into the left side of your heart where it’s pumped out to deliver oxygen to the rest of your body. Blood returns into the right side of your heart and is pumped into your lungs to pick up more oxygen. But if you have PAH, the arteries in your lungs get narrow, blocked or damaged, and scar tissue may form. This makes it harder for blood to flow from your heart through your lungs because of the pressure inside these vessels. As a result, the lower chamber of your heart, called the right ventricle, has to work harder to pump blood to your lungs. Left untreated, over time, PAH can damage the right side of your heart, causing it to weaken or even fail. Your body may not get the oxygen it needs to work like it should and you may feel dizzy, tired, or short of breath. For more information about pulmonary arterial hypertension, talk to your doctor.