This book provides an understanding of the challenges that individuals with Autism Spectrum Disorder (ASD) face in receiving medical care and helps equip medical professionals to overcome these challenges to provide high quality, compassionate medical care to this population. The book is divided into two sections. The first provides a broad perspective, providing background about the health care needs of patients with ASD and potential barriers to care that they may experience, as well as an overview of general principles in the delivery of care for patients with ASD. In the second section, the text focuses on specific medical issues and specialties, taking a systems-based approach to cover every major area of medical care. Each of these chapters discusses the problems in that area of medicine that are commonly encountered in the ASD population and the best approaches to managing these issues. The Massachusetts General Hospital Guide to Medical Care in Patients with Autism Spectrum Disorder is the ultimate resource for all physicians, allied health care professionals, medical students, residents, primary care providers, and specialists who treat patients with ASD.