Chronic respiratory disease which affect the trachea or bronchus It affects male 2.2 times more than female Can be classified into intrinsic or extrinsic type During asthma attack, the bronichio muscles constrict and decrease the flow of air in airways Extrinsic asthma: allergens irritates the airway, resulting in inflammation of the airways and may produce more mucous. As a result, airway becomes narrowed. Allergens: dust, pollens or cloth fibers etc. Intrinsic asthma: cause unknown, usually affects audults Asthma can be inherited   Shortness of breath Difficulty in breathing Wheezing Coughing Pressure in chest The insured should satisfied at least three of the following criteria: History of status asthmaticus within the past 2 years. Significant and continuous reduction in exercise tolerance Chest deformities resulting from chronic hyperinflation The need for oxygen therapy at home as medically prescribed Continuous daily use of oral corticosteroids for a minimum period of at least 6 consecutive months. History of status asthmaticus within the past 2 years. Mainly prevented and treated by medication