Pulmonary hypertension (PH) is a form of high blood pressure affecting the pulmonary artery, the vessel that carries deoxygenated blood into the lungs to pick up oxygen. It can lead to difficulty breathing and a reduction in usually performed activities, taking a physical and emotional toll on an affected individual's overall well-being. Pulmonary hypertension is a serious and progressive disease with several different causes.
Source: Verywell health