<unk>  <unk>  is a condition of elevated blood pressure (>25 mmHg at rest) within the pulmonary artery of the lungs, leading to myriad symptoms including shortness of breath, dizziness, syncope, chest pain, tachycardia and leg swelling.<unk>  has several differing etiologies and is a progressive and fatal disease if left untreated.<unk>  is classified by the World Health Organization (WHO) into 5 different groups, which will be discussed later on this page. Treatment is generally targeted toward the underlying etiology of disease. “Pulmonary arterial hypertension” (PAH) refers to group 1<unk>  in the updated WHO classification and<unk> ” <unk>  refers to any of group 2<unk>  through group 5<unk> .<unk>  is also used when referring to all five groups collectively.
Pulmonary hypertension
Portopulmonary hypertension
Asthma
Chronic obstructive pulmonary disease
Emphysema
Hypertensive heart disease
Pulmonary artery sclerosis
Chronic bronchitis