Asthma is a chronic condition that effects lungs & causes inflammation and constricting of the bronchial tubes, the pathways that allow air to enter and leave the lungs. If people with asthma are unveiled to a substance to which they are sensitive or a situation that changes their regular breathing patterns, the symptoms can become more severe. There are two types of asthma: allergic (caused by exposure to an allergen and non-allergic (caused by stress, exercise, illnesses like a cold or the flu, or exposure to extreme weather, irritants in the air or some medications).