Asthma is a common long-term inflammatory disease of the airways of the lungs.   It is characterised by variable and recurring symptoms, reversible airflow obstruction and easily triggered bronchospasms. Symptoms include episodes of wheezing, coughing chest tightness, and shortness of breath.  These may occur a few times a day or a few times per week.  Depending on the person, asthma symptoms may become worse at night or with exercise.