(StatePoint) Each year, 500 to 1,000 people in the United States are diagnosed with pulmonary arterial hypertension (PAH), a rare lung disease that can be fatal if left untreated.

To encourage earlier diagnosis of PAH , the American Lung Association, with support from Johnson & Johnson, is sharing information about the disease, its symptoms, and the importance of testing and proper treatment. Here’s what the Lung Association wants you to know:

What is PAH? PAH is a rare, progressive lung disease caused when the tiny arteries in your lungs become thickened and narrowed. This blocks blood flow through your lungs, causing the blood pressure in your lungs to rise. The heart has to work harder to pump blood through the narrowed arteries. Over time, your heart has difficulty effectively pum

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