10 Causes of Pulmonary Arterial Hypertension

9. High Altitudes

Low levels of oxygen in the blood can also cause pulmonary arterial hypertension. Obstructive sleep apnea (OSA) is a condition that affects your breathing when you are asleep and can result in PAH. This is also the case for those mountain climbers who spend much of their time in high altitudes. After a rapid ascent to high altitudes, it is harder to breathe. It has been described as if the air often feels ‘thin' to breathe when up so high. Which means there is not as much oxygen in it because it is less compressed. Mountain climbers need to trek carefully and keep their lungs in good shape with regular trips to the doctor.