It is estimated that perhaps as much as 20 million Americans impact on asthma. Perhaps half of the cases is due to allergies. It is commonly known as allergic asthma, although the symptoms are similar to those of other asthma cough, wheezing and difficulty breathing. However, if a person is exposed to something that is allergic to their attacks can be very serious. So people who suffer from allergic asthma should try to help the identification of a Specific allergies and their impact on asthma symptoms, as it is reasonable to work to avoid the allergens causing That Serious symptoms.