Asthma, a condition that makes breathing difficult, can be triggered by a number of factors, like pollen, smoke and cold air. Watch this video to learn exactly what causes asthma, and how you can prevent attacks.
Asthma, a condition that makes breathing difficult, can be triggered by a number of factors, like pollen, smoke and cold air. Watch this video to learn exactly what causes asthma, and how you can prevent attacks.