This book is an attempt to bring the fundamental research in shock focussing and its application in medical science and sono- luminescence together. It contains articles devoted to shock fo- cussing and bubble dynamics of shock focussing and their application in medical science. The destructive action of cavitation bubbles collapsing near boundary is dealt with emphasizing its importance in promoting damage of materials with special refe- rence to kidney stones. An interesting article on extracorporeal shock waves bioeffects and mechanism of action sheds light on future applications of shock waves which ultrasound might open one day. The current status of the development of shock measurement technique and correlated clinical findings is discussed. Shock theory of sonoluminescence is an important part of the book that addresses researchers in biophysics, medical physics and in the medical sciences.