Asthma is inflammation and narrowing of the airways (called the bronchial tubes).
Special Topics (Continued)
Leukotriene inhibitors for asthma and allergies
Asthma and allergic rhinitis (hay fever) are among the major causes of illness and disability in the United States, affecting as many as 40-50 million Americans. Scientists do not know why certain people experience allergic reactions, but they do know that increased amounts of a substance called leukotrienes play an important role in causing symptoms.