Urticaria or hives is a form of skin rash that is characterized by raised, red and itchy bumps. These may burn or sting. It is not uncommon for the patches of rash to move around. Usually, these rashes last for a few days and in few cases for more than six weeks. The condition often recurs. Angioedema is a similar condition to hives. Here swelling occurs in the lower layer of the skin and tissue just under the skin or mucous membranes. It may occur in the tongue, face, abdomen, larynx, arms and legs. Both these conditions can sometimes occur in conjunction often in response to an allergen. This combination is life-threatening and requires emergency treatment. This book contains some path-breaking studies in urticaria and angioedema. The topics included herein are of utmost significance and bound to provide incredible insights. For all readers who are interested in these conditions, the case studies included in this book will serve as an excellent guide to develop a comprehensive understanding.