Pulmonary Arterial Hypertension (PAH) | American Lung Association

Pulmonary Arterial Hypertension (PAH)

Pulmonary arterial hypertension (PAH) is one form of a broader condition known as pulmonary hypertension, which means high blood pressure in the lungs. In PAH, increased pressure in the vessels is caused by obstruction in the small arteries in the lung, for a variety of reasons.  In many cases of pulmonary arterial hypertension, the cause is unknown; others causes can be drug-related, HIV infection; connective tissue/autoimmune disorders (such as scleroderma) and others.

Learn About Pulmonary Arterial Hypertension

PAH occurs when the very small arteries throughout the lungs narrow in diameter, which increases the resistance to blood flow through the lungs. Over time, the increased blood pressure can damage the heart.

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Pulmonary Arterial Hypertension Symptoms, Causes and Risk Factors

A number of diseases and conditions can cause PAH, and symptoms are similar to the symptoms often seen in more common diseases, such as asthma, chronic obstructive pulmonary disease (COPD), and heart failure.

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Diagnosing and Treating Pulmonary Arterial Hypertension

The diagnosis of PAH requires numerous tests to determine the type and severity of pulmonary hypertension that you have and treatment is complicated and depends on many factors.

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Living with Pulmonary Arterial Hypertension

Learn what to expect after diagnosis, how best to manage the disease and where to find support.

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Questions to Ask Your Doctor about Pulmonary Arterial Hypertension

Making notes before your visit, as well as taking along a trusted family member or friend, can help you through the first appointment with your doctor.

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This content was developed in partnership with the CHEST Foundation, the philanthropic arm of the American College of Chest Physicians.

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