Asthma affects the airways of the lungs. With asthma, the airways' lining tends to always become hypersensitive, by redness and swelling or inflammation. It's similar to the skin becoming red, irritated, and sensitive after a sunburn. This hypersensitive state makes the airways react to things that you are exposed to every day, or asthma "triggers." A trigger could be the common cold, stress, changes in the weather, or things in the environment, such as dust, chemicals, smoke, and pet dandera
