Definition of Asthma - children:

Asthma is a disease of the respiratory system, which causes swelling and narrowing of the airways.

This article discusses asthma in children, also called pediatric asthma. For a more general discussion about the disease, please see asthma.

Causes, incidence, and risk factors:

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

Asthma is commonly seen in children. It is a leading cause of hospital stays and school absences. Asthma and allergies often occur together. The allergic response plays a strong role in childhood asthma.

Common asthma triggers include:

• Animals (hair or dander)
• Aspirin and other medications
• Cold air, such as changes in weather (most often cold weather)
• Chemicals in the air or in food
• Dust
• Exercise
• Mold
• Pollen
• Strong emotions
• Tobacco smoke
• Viral infections, such as the common cold