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.
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.
Visit Children and Clinical Studies to hear experts, parents, and children talk about their experiences with clinical research.
May 8, 2013
NIH statement on Asthma Month 2013
For Asthma Awareness Month 2013, the National Institutes of Health stands with the international community to renew our dedication to improving the quality of life for the estimated 300 million people living with asthma worldwide. To most effectively manage asthma, we need to address the disproportionate impact of the disease on minorities and families at or below the poverty line. NIH is committed to reducing asthma disparities and improving asthma control for all who live with the disease.
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.