Urticaria and angioedema.

This article discusses the allergist's or dermatologist's rational pathophysiologic approach to urticaria and angioedema. Every recognized cause is outlined and identified for preventing acute urticaria. Appreciating chronic urticaria as a "twitchy mast cell" syndrome is emphasized. The "art of pharmacologic" gymnastics is presented for the safest and most effective management of patients with urticaria.