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If you have asthma, you know how it feels to have a “flare-up.” It’s hard to breathe. You may cough a lot, or hear a whistling sound in your chest (called wheezing). Your chest may feel tight. You may feel tired and not want to play. Why does this happen? Use a paper horn to see how your lungs work. First, blow into the horn. Air goes in and out. That’s what healthy lungs are like. Now squeeze the middle of the horn (like the doctor in the picture). Air can’t get in and out. That’s like your lungs when you have an asthma flare-up.
Of course, lungs aren’t exactly like a paper horn. Inside the lungs, air goes in and out through very small tubes. These tubes are called airways. Asthma makes airways a little bit inflamed all the time. (That means swollen and red, like your nose when you have a cold.) Air can still go in and out. You may not notice a problem. But lots of things can bother inflamed airways. Then they get even more swollen. Pushing the air in and out gets harder. Less air gets into your lungs. That’s a flare-up.
Color the open airways green. Color the narrow airways red.