Asthma is a disease affecting the airways that carry air to and from the lungs. Asmatic airways are usually swollen or inflamed on inside walls. This swelling or inflammation causes the airways to be extremely sensitive to irritation and increases the susceptibility to allergic reactions. As inflammation causes the airways to become narrower, less air can pass through the lungs making it difficult to breathe. Asthma is an incurable illness, however, with good treatment and management, a person with asthma can live a normal and active life.