An allergy is your body’s response to a foreign substance that’s not usually harmful to your body. These foreign substances are called allergens. They can include a number of items such as certain foods, pollen, or pet dander. With different allergens, your body may react any number of ways including inflammation, sneezing, or a range of other symptoms. Allergy symptoms can create complications. Your doctor can help determine the cause of your symptoms as well as the difference between a sensitivity and a full-blown allergy. Your doctor can also teach you how to manage your allergy symptoms.