In This Story: AllergyAllergies are a number of conditions caused by hypersensitivity of the immune system to typically harmless substances in the environment. These include hay fever, food allergies, atopic dermatitis, allergic asthma, and anaphylaxis. Food, insect stings, and medications are common causes of severe reactions. Treatments for allergies include the avoidance of known allergens and the use of medications such as steroids and antihistamines. In severe reactions injectable adrenaline (epinephrine) is recommended.
