Asthma: In Depth

Asthma is a chronic lung disease that affects people of all ages. It causes episodes of wheezing, coughing, shortness of breath, and chest tightness. Although there is no cure, most people with asthma are able to manage the disease with medications and behavioral changes.

Researchers also are studying various complementary health approaches for asthma relief. This fact sheet provides basic information about asthma, summarizes scientific research on the effectiveness and safety of complementary health approaches for asthma, and suggests sources for additional information.

Key Points

About Asthma

In asthma, the airways that carry air into and out of the lungs become irritated, inflamed, and narrowed. The muscles around the airways tighten and the cells in the airway produce more mucus than normal. This makes it difficult for air to flow into and out of the lungs and causes wheezing, shortness of breath, and other symptoms.

More than 24 million people in the United States have been diagnosed with asthma, including approximately 7 million children. It is not known why some people develop asthma, but the tendency runs in families and the chance of having the disease appears to be increasing, especially among children.

Conventional treatment for asthma focuses on preventing attacks and relieving symptoms once an attack is underway. Prevention may include avoiding “asthma triggers” (the things that can set off or worsen symptoms) or taking medicine every day to prevent symptoms.

Once an asthma attack is underway, quick-relief medications may be used to relax muscles around the airways and open up airways so air can flow through them. Prevention techniques are generally preferred over quick-relief medications.

For more information about asthma, visit the National Heart, Lung, and Blood Institute website.

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