This "hypersensitivity" causes their body to react in certain ways. Usually a person who is atopic develops "allergic rhinitis" which affects the "nasal passages" which are behind the nose and they are also more likely to get "atopic dermatitis" which causes skin rashes and "atopic asthma". Up to 40% of people with allergic rhinitis also have asthma. These three medical problems, "allergic rhinitis", "atopic dermatitis" and "atopic asthma" are called the "Atopic Triad" (a "triad" is when there is three of something). People who are atopic may also have other medical problems including food and drug allergies, stinging-insect hypersensitivity, hives ("urticaria"), Quincke's edema ("angioedema"), and contact dermatitis.