Shortness of breath. Tightness in the chest. Wheezing and coughing. These distressing symptoms are a daily fact of life for many of the fifteen million Americans who suffer from asthma, including nearly six million children -- and asthma is on the rise. But even those with severe asthma can lead full, active lives with the help of the experts at Harvard Medical School and Partners Asthma Center. Here is a commonsense guide that includes: