Asthma (AZ-ma) is a (long-term) lung disease that inflames and narrows the airways. Asthma causes recurring of wheezing (a whistling sound when you breathe), tightness, shortness of breath, and . The coughing often occurs at night or early in the morning.
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.
To understand asthma, it helps to know how the airways work. The airways are tubes that carry air into and out of your . People who have asthma have inflamed airways. This makes them swollen and very sensitive. They tend to react strongly to certain inhaled substances.
When the airways react, the around them tighten. This narrows the airways, causing less air to flow into the . The swelling…