At the point when asthma is not under control, the air routes become swollen. Irritation of the aviation routes causes the symptoms of asthma (breathlessness, wheezing, chest coughing and snugness) by confining or restricting the airflow to and from the lungs.  The air routes become red and swollen, which makes them thinner. This problem can frequently take a few hours or days to occur and may take the same duration to switch after the asthma attack has passed. Along with this tightening of muscles can occur rapidly, based on the seriousness of symptoms and inflammation.