(WTVM) - Asthma is a common condition affecting nearly 20 million people in the United States. Nearly 9 million of them are children.
Dr. Paula Walker explains asthma and how can it be controlled.
Watch the video for answers to these questions:
*What causes asthma?
*What are the most common symptoms of asthma?
*How often do asthma symptoms occur?
*What are the most common triggers of asthma?
*What are the risk factors of asthma?