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An allergy is conventionally thought of as an excessive reaction between an antigen (allergen) and an antibody. Some people, through their genetic inheritance, produce large numbers of the kind of antibodies which cause the release of large quantities of histamine when they bind to certain antigens (allergens); histamine can cause large quantities of fluid to leak out of blood vessels and tissues, resulting in the distressing symptoms of allergy - local swelling, redness and itching.
Into this category of allergic reaction come hay fever and allergic rhinitis, coeliac disease, certain forms of asthma and conjunctivitis, eczema and urticaria. In a few people the histamine reaction occurs throughout the body (anaphylaxis) and can cause death from shock or suffocation.
Links to positive findings for homeopathy for this medical condition are found at BHA