Allergic diseases comprise conditions like anaphylactic shock, urticaria, angioedema, hay fever, allergic conjunctivitis, bronchial asthma, hypersensitivity pneumonitis, serum sickness, allergic vasculitis, contact dermatitis, granulomatous reactions and the whole spectrum of adverse food and drug reactions. In a concise and practical way this book covers all aspects of allergic reactions from pathophysiology to diagnosis, therapy, and prevention with a strong focus on relevant aspects for the everyday work of the practicing dermatologist and allergist in the hospital or office. In this book, not only IgE-mediated allergic reactions are covered, but all other kinds of allergies like hematologic cytopenias, atopic eczema, contact dermatitis, drug eruptions, anaphylaxis and food allergy are equally represented as well as psychosomatic aspects and the problem of environmental intolerances.