What is PAH?
Pulmonary arterial hypertension, or PAH, is a medical condition affecting the heart and lungs. People who have PAH develop high blood pressure (hypertension) in the arteries of their lungs (the pulmonary arteries). In order to push enough blood through pulmonary arteries narrowed by PAH, the heart must work harder. Over time, the heart loses its ability to pump as much blood as the body needs. Symptoms, such as a reduced ability to exercise, begin to develop.
