Is PAH the same as pulmonary hypertension?

Pulmonary Arterial Hypertension (PAH) is a specific type of pulmonary hypertension characterized by high blood pressure in the pulmonary arteries, primarily due to narrowing or blockage of these vessels. While all PAH is a form of pulmonary hypertension, not all pulmonary hypertension is PAH; pulmonary hypertension can also result from other conditions such as left Heart disease, lung diseases, or chronic blood clots. Therefore, PAH is a subset of the broader category of pulmonary hypertension.