66 patients with chronic urticaria were examined using a three-stage examination protocol. Stage I. consisted of case history, general dermatological and internal physical examination and routine laboratory tests. Stage II. comprised investigation for focal infections (dental, oto-laryngeal, gynecological, bile culture), determination of AST, acidity tests of the stomach and aimed radiological examinations. Stage III. consisted of immunological laboratory tests (immune complex, Igs, IgE, special IgE determination) and allergological examinations (epicutaneous, intracutaneous probes, Prick test).