Question: what is the difference between pulmonary arterial hypertension and pulmonary hypertension?
Answer: PH vs. PAH: What's the Difference? Pulmonary hypertension (PH) is a general term used to describe high blood pressure in the lungs from any cause. Pulmonary arterial hypertension (PAH) is a chronic and currently incurable disease that causes the walls of the arteries of the lungs to tighten and stiffen.