Some of the more common allergy types involve food, pets, dust, and pollen, but the list goes on. Learn which trigger more severe allergy symptoms Learn about the common types of allergies , such as seasonal, food, skin, insect sting, and drug allergies . Find out how they are caused, diagnosed, and treated, and how to prevent them. Allergy , hypersensitivity reaction by the body to foreign substances (antigens) that in similar amounts and circumstances are harmless within the bodies of other people. Antigens that provoke an allergic reaction are called allergens. Typical allergens include pollens, drugs, lints, bacteria,
