Asthma is an increasingly common lung disease in the U.S. People who have asthma have inflamed and highly irritable airways. When the airways are exposed to irritants, they narrow, making breathing more difficult. Signs of asthma include wheezing, coughing, chest tightness and difficulty breathing, especially at night and early in the morning. Common irritants include tobacco smoke, air pollution, viral infection and allergens like dust mites and cat dander. Vigorous exercise also can act like an irritant by triggering airway spasm and narrowing. This is referred to as exercise-induced asthma.

The ABCs of Exercise-induced Asthma

About five to 10 minutes into a strenuous soccer game you start to cough

and feel short of breath. You tell yourself that you’re out of shape and recommit to your resolution to participate in vigorous cardiovascular exercise at least three days per week. But then, the next time and the time after that the same feelings of difficulty breathing set in. You finally go visit your doctor, who tells you that you have asthma. But this only happens with exercise, you say.

People who exercise regularly will tell you they feel better. Some will say it’s because chemicals called neurotransmitters, which are produced in the brain, are stimulated during exercise. Since it’s believed that neurotransmitters mediate people’s moods and emotions, they can make you feel better and less stressed.