An Illustrated Handbook of Asthma


1.Asthma Rates on the Rise

The number of people with asthma has been going up steadily in the U.S. for decades. Some researchers suggest it’s because of better hygiene: The theory is that fewer childhood infections lead to under-developed immune systems, which means a greater risk of asthma. It might also be because we use more household cleaning sprays, we have more exposure to air pollution, or we are being exposed to more toxins in the environment.


2.Who Gets Asthma?

Typically, it develops during childhood, but it can affect you at any age. People who have allergies or a parent or close family member with asthma are more likely to have the condition. More boys have asthma than girls, but it’s more common in women than in men.