10 Causes of Pulmonary Arterial Hypertension

10. Cause Unknown

In rare cases the direct cause of the onset of PAH is unknown. This case does still, however, have its own name; it's called idiopathic pulmonary arterial hypertension (IPAH). IPAH is much rarer than PAH, and it occurs in around one in every million PAH patients per year. More common in women and young adults, there is still research being conducted to find any links PAH has with any other condition in the body. We do know, however, that it has no link to pulmonary high blood pressure.