Allergy affliction is a term used to describe a medical condition caused by an allergic reaction. Asthma is one of the most common forms of allergy affliction, and is characterized by difficulty breathing, wheezing, coughing, and chest tightness. It is caused by an allergic reaction to environmental triggers such as pollen, dust mites, mold, pet dander, and smoke. Treatment for asthma includes avoiding triggers, taking medications, and using inhalers.