In this, the ninth edition of Mayo Clinic Internal Medicine Board Review , the chapters were extensively revised and expanded to include new treatment guidelines, recent advances in the science of medicine, and evidence-based recommendations. The book includes many features that facilitate retention of the vast amount of knowledge imparted, including bullet points, more than 450 questions and their answers that simulate those used on the American Board of Internal Medicine examinations, and pharmacy reviews that reflect current information about the medications in each subspecialty. The editor and associate editors added their depth of experience to make this the finest edition of the book in its long history. The book is a must-have for anyone preparing for board certification or recertification and is a valuable resource for physicians who are in training and practicing clinicians.