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Is this a problem of my heart or my lungs?

Pulmonary arterial hypertension is a condition that results in high blood pressures in the blood vessels that carry blood from the right side of your heart to your lungs. All blood vessels are part of the circulatory or cardiovascular system (which includes the heart), but the pulmonary arteries are also considered part of the respiratory system (which includes the lungs).

In reality, the heart and the lungs are so closely interconnected that pulmonary arterial hypertension ends up affecting both how the lungs work and how the heart works. You may end up seeing both a heart or a lung doctor, or both, as part of the evaluation and treatment of pulmonary arterial hypertension.