There are many different types of allergic reactions - depending on the extent to which bodies they arise. But all have the same clinical manifestations of nature - hypersensitivity to allergens.
When symptoms arise in the nasal cavity and lungs, we are talking about respiratory allergies, skin - the skin, in the eyes - the eye allergies.
Another way of classifying allergies is depending on the cause of allergic reaction. In fact, the numbers of substances - potential allergens are very high. There are allergic to insect bite, food and medicine, house dust mites, etc.