The epidemiology of IPAH is about 125–150 deaths per year in the U.S., and worldwide the incidence is similar at 4 cases per million. However, in parts of Europe (France), indications are 6 cases per million of IPAH. Females have a higher incidence rate than males (2–9:1). Other forms of<unk>  are far more common. In systemic scleroderma, the incidence has been estimated to be 8 to 12% of all patients; in rheumatoid arthritis it is rare. However, in systemic lupus erythematosus it is 4 to 14%, and in sickle cell disease, it ranges from 20 to 40%. Up to 4% of people who suffer a pulmonary embolism go on to develop chronic thromboembolic disease including<unk> . A small percentage of patients with COPD develop<unk>  with no other disease to explain the high pressure. On the other hand, obesity-hypoventilation syndrome is very commonly associated with right heart failure due to<unk> .
Pulmonary hypertension
Portopulmonary hypertension
Chronic thromboembolic pulmonary hypertension
Asthma
Chronic obstructive pulmonary disease
Emphysema
Hypertensive heart disease
Reactive airway disease