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Who Is at Risk for Asthma?

Asthma affects people of all ages, but it most often starts during childhood. In the United States, more than 25 million people are known to have asthma. About 7 million of these people are children.

Young children who often wheeze and have respiratory infections—as well as certain other risk factors—are at highest risk of developing asthma that continues beyond 6 years of age. The other risk factors include having allergies, eczema (an allergic skin condition), or parents who have asthma.

Among children, more boys have asthma than girls. But among adults, the disease affects men and women equally. It's not clear whether or how sex and sex hormones play a role in causing asthma.

Most, but not all, people who have asthma have allergies.

Some people develop asthma because of contact with certain chemical irritants or industrial dusts in the workplace. This type of asthma is called occupational asthma.

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Asthma Clinical Trials

Clinical trials are research studies that explore whether a medical strategy, treatment, or device is safe and effective for humans. To find clinical trials that are currently underway for Asthma, visit www.clinicaltrials.gov.

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Visit Children and Clinical Studies to hear experts, parents, and children talk about their experiences with clinical research.


Asthma in the News

February 11, 2014
NIH study seeks to improve asthma therapy for African-Americans
Researchers will enroll around 500 African-American children and adults who have asthma in a multi-center clinical trial to assess how they react to therapies and to explore the role of genetics in determining the response to asthma treatment. This new clinical study, which will take place at 30 sites in 14 states, is aimed at understanding the best approach to asthma management in African-Americans.

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June 15, 2012 Last Updated Icon

The NHLBI updates Health Topics articles on a biennial cycle based on a thorough review of research findings and new literature. The articles also are updated as needed if important new research is published. The date on each Health Topics article reflects when the content was originally posted or last revised.

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