Asthma is a chronic disease that affects about 20 million Americans. Its primary cause is inflamed airways in the lungs. This inflammation makes the airways smaller, which makes it more difficult for air to move in and out of the lungs. Asthma is the most common serious disease among children, affecting nine million in the United States.
Signs that you might have asthma include coughing, wheezing, shortness of breath, and chest tightness.
Many people have “allergic asthma,” which means that allergens – like dust mites, mold, animal dander, pollen and cockroaches – make their symptoms worse.