Overview

American Academy of Allergy, Asthma & Immunology

Asthma is a chronic disease involving the airways in the lungs. These airways, or bronchial tubes, allow air to come in and out of the lungs.

American Lung Association

Asthma is a lung disease that makes breathing difficult for millions of Americans, both young and old. There is no cure for asthma, but the good news is it can be managed and treated so you can live a normal, healthy life.

Encyclopedia of Wellness: From Açaí Berry to Yo-Yo Dieting

Asthma is a disease that affects breathing. It attacks and damages lungs and airways. Data from the Centers for Disease Control and Prevention (CDC) National Center for Health Statistics shows that in 2009 over 24 million Americans suffered from asthma.

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Environmental Protection Agency

Asthma is a serious, sometimes life-threatening chronic respiratory disease that affects the quality of life for almost 25 million Americans, including an estimated 7 million children.

MedlinePlus

Asthma is caused by inflammation (swelling) in the airways. When an asthma attack occurs, the lining of the air passages swells and the muscles surrounding the airways become tight. This reduces the amount of air that can pass through the airway.

National Heart, Lung, and Blood Institute

Welcome to So You Have Asthma - your one-stop source for the latest information on controlling your asthma provided by the National Heart, Lung, and Blood Institute. This guide offers practical suggestions to help you manage your asthma.

The Gale Encyclopedia of Medicine

Asthma is a chronic (long-lasting) inflammatory disease of the airways. In those susceptible to asthma, this inflammation causes the airways to spasm and swell periodically so that the airways narrow. The individual then must wheeze or gasp for air.

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