Allergic affliction is a term used to describe a range of medical conditions that are caused by an allergic reaction. Asthma is one of the most common allergic afflictions, and is characterized by difficulty breathing, wheezing, coughing, and tightness in the chest. It is caused by an overreaction of the body's immune system to certain triggers, such as dust, pollen, pet dander, and smoke. Treatment for asthma typically involves avoiding triggers, taking medications, and using inhalers.