Acute geriatrics has become an important specialist discipline. It comprises the preventive, curative, rehabilitative and palliative care for older patients under consideration of the bio-psycho-social model. Multimorbidity, atypical courses of disease, increased risk of complications and many further aspects should be included in the support concept for the often very vulnerable patients. In this book, essential practice-relevant content of the acute geriatric work is presented, based on case studies.