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Dr. Anita Gupta, Anesthesiology, answeredAllergic asthma is a common form of asthma that occurs when an allergen, such as pollen, pet dander, dust mites, or molds, is inhaled. These allergens trigger a hypersensitive response in the immune system that causes the airway passages to become inflamed. The muscles around the airways also tighten. Symptoms include coughing, wheezing, shortness of breath, rapid breathing, and chest tightening. Determining which allergens are causing asthma symptoms is essential so people can avoid these triggers and control asthma.