Allergic diseases are usually defined as significant pathological changes caused by the immune system over-reacting to contact with harmless substances. Generally speaking, allergic reactions involve at least part of type I hypersensitivity and IgE. Major allergic conditions involving IgE include conjunctivitis, asthma and allergic, allergic rhinitis, allergic reactions to certain foods and drugs, allergic reactions to insect bites, atopic dermatitis and allergic reactions to other less common harmless substances.
Learn more: IgE-mediated inflammation in allergic disorders
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